locate: add pointer to files command in help

locate: add pointer to files command in help

--- a/mercurial/commands.py	Tue Sep 16 11:08:14 2014 -0500
+++ b/mercurial/commands.py	Tue Sep 16 11:08:29 2014 -0500
@@ -4178,6 +4178,8 @@
     will avoid the problem of "xargs" treating single filenames that
     contain whitespace as multiple filenames.
 
+    See :hg:`help files` for a more versatile command.
+
     Returns 0 if a match is found, 1 otherwise.
     """
     end = opts.get('print0') and '\0' or '\n'