subrepo: update help for commit to reflect new default behavior

Update the subrepo help to be consistent with the new default behavior,
which is to abort if any subrepo is dirty.

mercurial/help/subrepos.txt

@@ -1,134 +1,135 b''
 Subrepositories let you nest external repositories or projects into a
 parent Mercurial repository, and make commands operate on them as a
 group.
 
 Mercurial currently supports Mercurial, Git, and Subversion
 subrepositories.
 
 Subrepositories are made of three components:
 
 1. Nested repository checkouts. They can appear anywhere in the
    parent working directory.
 
 2. Nested repository references. They are defined in ``.hgsub`` and
    tell where the subrepository checkouts come from. Mercurial
    subrepositories are referenced like:
 
      path/to/nested = https://example.com/nested/repo/path
 
    Git and Subversion subrepos are also supported:
 
      path/to/nested = [git]git://example.com/nested/repo/path
      path/to/nested = [svn]https://example.com/nested/trunk/path
 
    where ``path/to/nested`` is the checkout location relatively to the
    parent Mercurial root, and ``https://example.com/nested/repo/path``
    is the source repository path. The source can also reference a
    filesystem path.
 
    Note that ``.hgsub`` does not exist by default in Mercurial
    repositories, you have to create and add it to the parent
    repository before using subrepositories.
 
 3. Nested repository states. They are defined in ``.hgsubstate`` and
    capture whatever information is required to restore the
    subrepositories to the state they were committed in a parent
    repository changeset. Mercurial automatically record the nested
    repositories states when committing in the parent repository.
 
    .. note::
       The ``.hgsubstate`` file should not be edited manually.
 
 
 Adding a Subrepository
 ----------------------
 
 If ``.hgsub`` does not exist, create it and add it to the parent
 repository. Clone or checkout the external projects where you want it
 to live in the parent repository. Edit ``.hgsub`` and add the
 subrepository entry as described above. At this point, the
 subrepository is tracked and the next commit will record its state in
 ``.hgsubstate`` and bind it to the committed changeset.
 
 Synchronizing a Subrepository
 -----------------------------
 
 Subrepos do not automatically track the latest changeset of their
 sources. Instead, they are updated to the changeset that corresponds
 with the changeset checked out in the top-level changeset. This is so
 developers always get a consistent set of compatible code and
 libraries when they update.
 
 Thus, updating subrepos is a manual process. Simply check out target
 subrepo at the desired revision, test in the top-level repo, then
 commit in the parent repository to record the new combination.
 
 Deleting a Subrepository
 ------------------------
 
 To remove a subrepository from the parent repository, delete its
 reference from ``.hgsub``, then remove its files.
 
 Interaction with Mercurial Commands
 -----------------------------------
 
 :add: add does not recurse in subrepos unless -S/--subrepos is
     specified. Subversion subrepositories are currently silently
     ignored.
 
 :archive: archive does not recurse in subrepositories unless
     -S/--subrepos is specified.
 
 :commit: commit creates a consistent snapshot of the state of the
-    entire project and its subrepositories. It does this by first
-    attempting to commit all modified subrepositories, then recording
-    their state and finally committing it in the parent
-    repository. Mercurial can be made to abort if any subrepository
-    content is modified by setting "ui.commitsubrepos=no" in a
-    configuration file (see :hg:`help config`).
+    entire project and its subrepositories. If any subrepositories
+    have been modified, Mercurial will abort.  Mercurial can be made
+    to instead commit all modified subrepositories by specifying
+    -S/--subrepos, or setting "ui.commitsubrepos=True" in a
+    configuration file (see :hg:`help config`).  After there are no
+    longer any modified subrepositories, it records their state and
+    finally commits it in the parent repository.
 
 :diff: diff does not recurse in subrepos unless -S/--subrepos is
     specified. Changes are displayed as usual, on the subrepositories
     elements. Subversion subrepositories are currently silently
     ignored.
 
 :incoming: incoming does not recurse in subrepos unless -S/--subrepos
     is specified. Subversion subrepositories are currently silently
     ignored.
 
 :outgoing: outgoing does not recurse in subrepos unless -S/--subrepos
     is specified. Subversion subrepositories are currently silently
     ignored.
 
 :pull: pull is not recursive since it is not clear what to pull prior
     to running :hg:`update`. Listing and retrieving all
     subrepositories changes referenced by the parent repository pulled
     changesets is expensive at best, impossible in the Subversion
     case.
 
 :push: Mercurial will automatically push all subrepositories first
     when the parent repository is being pushed. This ensures new
     subrepository changes are available when referenced by top-level
     repositories.
 
 :status: status does not recurse into subrepositories unless
     -S/--subrepos is specified. Subrepository changes are displayed as
     regular Mercurial changes on the subrepository
     elements. Subversion subrepositories are currently silently
     ignored.
 
 :update: update restores the subrepos in the state they were
     originally committed in target changeset. If the recorded
     changeset is not available in the current subrepository, Mercurial
     will pull it in first before updating.  This means that updating
     can require network access when using subrepositories.
 
 Remapping Subrepositories Sources
 ---------------------------------
 
 A subrepository source location may change during a project life,
 invalidating references stored in the parent repository history. To
 fix this, rewriting rules can be defined in parent repository ``hgrc``
 file or in Mercurial configuration. See the ``[subpaths]`` section in
 hgrc(5) for more details.