commands: stress that commit is a local operation

mercurial/commands.py

@@ -609,7 +609,9 b' def clone(ui, source, dest=None, **opts)'
 def commit(ui, repo, *pats, **opts):
     """commit the specified files or all outstanding changes
 
-    Commit changes to the given files into the repository.
+    Commit changes to the given files into the repository.  Unlike a
+    centralized RCS, this operation is a local operation.  See hg push
+    for means to actively distribute your changes.
 
     If a list of files is omitted, all changes reported by "hg status"
     will be committed.