share: remove unexpected heading from "verbose" container in help test

`test-gendoc-*.t` have been failing for me since 91425656e2b1 (share:
add documentation about share-safe mode in `hg help -e share`,
2020-11-27) with this kind of output:

```
    --- /usr/local/google/home/martinvonz/hg/tests/test-gendoc-ru.t
    +++ /usr/local/google/home/martinvonz/hg/tests/test-gendoc-ru.t.err
    @@ -2,3 +2,9 @@

       $ $TESTDIR/check-gendoc ru
       checking for parse errors
    +  gendoc.txt:12818: (SEVERE/4) Unexpected section title.
    +
    +  Sharing requirements and configs of source repository with shares
    +  -----------------------------------------------------------------
    +  Exiting due to level-4 (SEVERE) system message.
    +  [1]
```

This patch fixes that.

Differential Revision: https://phab.mercurial-scm.org/D9552

hgext/share.py

@@ -1,237 +1,236 b''
 # Copyright 2006, 2007 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 '''share a common history between several working directories
 
 The share extension introduces a new command :hg:`share` to create a new
 working directory. This is similar to :hg:`clone`, but doesn't involve
 copying or linking the storage of the repository. This allows working on
 different branches or changes in parallel without the associated cost in
 terms of disk space.
 
 Note: destructive operations or extensions like :hg:`rollback` should be
 used with care as they can result in confusing problems.
 
 Automatic Pooled Storage for Clones
 -----------------------------------
 
 When this extension is active, :hg:`clone` can be configured to
 automatically share/pool storage across multiple clones. This
 mode effectively converts :hg:`clone` to :hg:`clone` + :hg:`share`.
 The benefit of using this mode is the automatic management of
 store paths and intelligent pooling of related repositories.
 
 The following ``share.`` config options influence this feature:
 
 ``share.pool``
     Filesystem path where shared repository data will be stored. When
     defined, :hg:`clone` will automatically use shared repository
     storage instead of creating a store inside each clone.
 
 ``share.poolnaming``
     How directory names in ``share.pool`` are constructed.
 
     "identity" means the name is derived from the first changeset in the
     repository. In this mode, different remotes share storage if their
     root/initial changeset is identical. In this mode, the local shared
     repository is an aggregate of all encountered remote repositories.
 
     "remote" means the name is derived from the source repository's
     path or URL. In this mode, storage is only shared if the path or URL
     requested in the :hg:`clone` command matches exactly to a repository
     that was cloned before.
 
     The default naming mode is "identity".
 
 .. container:: verbose
 
-    Sharing requirements and configs of source repository with shares
-    -----------------------------------------------------------------
+    Sharing requirements and configs of source repository with shares:
 
     By default creating a shared repository only enables sharing a common
     history and does not share requirements and configs between them. This
     may lead to problems in some cases, for example when you upgrade the
     storage format from one repository but does not set related configs
     in the shares.
 
     Setting `format.exp-share-safe = True` enables sharing configs and
     requirements. This only applies to shares which are done after enabling
     the config option.
 
     For enabling this in existing shares, enable the config option and reshare.
 
     For resharing existing shares, make sure your working directory is clean
     and there are no untracked files, delete that share and create a new share.
 '''
 
 from __future__ import absolute_import
 
 import errno
 from mercurial.i18n import _
 from mercurial import (
     bookmarks,
     commands,
     error,
     extensions,
     hg,
     registrar,
     txnutil,
     util,
 )
 
 cmdtable = {}
 command = registrar.command(cmdtable)
 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
 testedwith = b'ships-with-hg-core'
 
 
 @command(
     b'share',
     [
         (b'U', b'noupdate', None, _(b'do not create a working directory')),
         (b'B', b'bookmarks', None, _(b'also share bookmarks')),
         (
             b'',
             b'relative',
             None,
             _(b'point to source using a relative path'),
         ),
     ],
     _(b'[-U] [-B] SOURCE [DEST]'),
     helpcategory=command.CATEGORY_REPO_CREATION,
     norepo=True,
 )
 def share(
     ui, source, dest=None, noupdate=False, bookmarks=False, relative=False
 ):
     """create a new shared repository
 
     Initialize a new repository and working directory that shares its
     history (and optionally bookmarks) with another repository.
 
     .. note::
 
        using rollback or extensions that destroy/modify history (mq,
        rebase, etc.) can cause considerable confusion with shared
        clones. In particular, if two shared clones are both updated to
        the same changeset, and one of them destroys that changeset
        with rollback, the other clone will suddenly stop working: all
        operations will fail with "abort: working directory has unknown
        parent". The only known workaround is to use debugsetparents on
        the broken clone to reset it to a changeset that still exists.
     """
 
     hg.share(
         ui,
         source,
         dest=dest,
         update=not noupdate,
         bookmarks=bookmarks,
         relative=relative,
     )
     return 0
 
 
 @command(b'unshare', [], b'', helpcategory=command.CATEGORY_MAINTENANCE)
 def unshare(ui, repo):
     """convert a shared repository to a normal one
 
     Copy the store data to the repo and remove the sharedpath data.
     """
 
     if not repo.shared():
         raise error.Abort(_(b"this is not a shared repo"))
 
     hg.unshare(ui, repo)
 
 
 # Wrap clone command to pass auto share options.
 def clone(orig, ui, source, *args, **opts):
     pool = ui.config(b'share', b'pool')
     if pool:
         pool = util.expandpath(pool)
 
     opts['shareopts'] = {
         b'pool': pool,
         b'mode': ui.config(b'share', b'poolnaming'),
     }
 
     return orig(ui, source, *args, **opts)
 
 
 def extsetup(ui):
     extensions.wrapfunction(bookmarks, b'_getbkfile', getbkfile)
     extensions.wrapfunction(bookmarks.bmstore, b'_recordchange', recordchange)
     extensions.wrapfunction(bookmarks.bmstore, b'_writerepo', writerepo)
     extensions.wrapcommand(commands.table, b'clone', clone)
 
 
 def _hassharedbookmarks(repo):
     """Returns whether this repo has shared bookmarks"""
     if bookmarks.bookmarksinstore(repo):
         # Kind of a lie, but it means that we skip our custom reads and writes
         # from/to the source repo.
         return False
     try:
         shared = repo.vfs.read(b'shared').splitlines()
     except IOError as inst:
         if inst.errno != errno.ENOENT:
             raise
         return False
     return hg.sharedbookmarks in shared
 
 
 def getbkfile(orig, repo):
     if _hassharedbookmarks(repo):
         srcrepo = hg.sharedreposource(repo)
         if srcrepo is not None:
             # just orig(srcrepo) doesn't work as expected, because
             # HG_PENDING refers repo.root.
             try:
                 fp, pending = txnutil.trypending(
                     repo.root, repo.vfs, b'bookmarks'
                 )
                 if pending:
                     # only in this case, bookmark information in repo
                     # is up-to-date.
                     return fp
                 fp.close()
             except IOError as inst:
                 if inst.errno != errno.ENOENT:
                     raise
 
             # otherwise, we should read bookmarks from srcrepo,
             # because .hg/bookmarks in srcrepo might be already
             # changed via another sharing repo
             repo = srcrepo
 
             # TODO: Pending changes in repo are still invisible in
             # srcrepo, because bookmarks.pending is written only into repo.
             # See also https://www.mercurial-scm.org/wiki/SharedRepository
     return orig(repo)
 
 
 def recordchange(orig, self, tr):
     # Continue with write to local bookmarks file as usual
     orig(self, tr)
 
     if _hassharedbookmarks(self._repo):
         srcrepo = hg.sharedreposource(self._repo)
         if srcrepo is not None:
             category = b'share-bookmarks'
             tr.addpostclose(category, lambda tr: self._writerepo(srcrepo))
 
 
 def writerepo(orig, self, repo):
     # First write local bookmarks file in case we ever unshare
     orig(self, repo)
 
     if _hassharedbookmarks(self._repo):
         srcrepo = hg.sharedreposource(self._repo)
         if srcrepo is not None:
             orig(self, srcrepo)