share: drop experimental label

As per mail from Matt:

  http://selenic.com/pipermail/mercurial/2010-March/030774.html

hgext/share.py

@@ -1,37 +1,37
 # 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'''
 
 from mercurial.i18n import _
 from mercurial import hg, commands
 
 def share(ui, source, dest=None, noupdate=False):
-    """create a new shared repository (experimental)
+    """create a new shared repository
 
     Initialize a new repository and working directory that shares its
     history 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
     (e.g. tip).
     """
 
     return hg.share(ui, source, dest, not noupdate)
 
 cmdtable = {
     "share":
     (share,
      [('U', 'noupdate', None, _('do not create a working copy'))],
      _('[-U] SOURCE [DEST]')),
 }
 
 commands.norepo += " share"