visibility: fix a comment introduced before which is not up-to-date

265cd9e19d26 introduced a comment in _filterederror that was not updated with
the latest iterations of the patch, fix the comment.

Differential Revision: https://phab.mercurial-scm.org/D1851

mercurial/context.py

@@ -439,8 +439,8 b' def _filterederror(repo, changeid):'
         unfilteredrepo = repo.unfiltered()
         ctx = unfilteredrepo[changeid]
 
-        # If the changeset is obsolete, enrich the hint with the reason that
-        # made this changeset not visible
+        # If the changeset is obsolete, enrich the message with the reason
+        # that made this changeset not visible
         if ctx.obsolete():
             reason = obsutil._getfilteredreason(unfilteredrepo, ctx)
             msg = _("hidden revision '%s' %s") % (changeid, reason)