Make clear that hg pull -r REV pulls "up to" a revision.

The existing message was a bit confusing, making the reader
believe that only the specific revision is pulled.

mercurial/commands.py

@@ -2964,7 +2964,7 b' table = {'
           ('n', 'newest-first', None, _('show newest record first')),
           ('', 'bundle', '', _('file to store the bundles into')),
           ('p', 'patch', None, _('show patch')),
-          ('r', 'rev', [], _('a specific revision you would like to pull')),
+          ('r', 'rev', [], _('a specific revision up to which you would like to pull')),
           ('', 'template', '', _('display with template')),
           ('e', 'ssh', '', _('specify ssh command to use')),
           ('', 'remotecmd', '',
@@ -3039,7 +3039,7 b' table = {'
           ('e', 'ssh', '', _('specify ssh command to use')),
           ('f', 'force', None,
            _('run even when remote repository is unrelated')),
-          ('r', 'rev', [], _('a specific revision you would like to pull')),
+          ('r', 'rev', [], _('a specific revision up to which you would like to pull')),
           ('', 'remotecmd', '',
            _('specify hg command to run on the remote side'))],
          _('hg pull [-u] [-r REV]... [-e FILE] [--remotecmd FILE] [SOURCE]')),