document missing template variables stable

document missing template variables

--- a/mercurial/templates/template-vars.txt	Thu Apr 15 18:52:59 2010 +0200
+++ b/mercurial/templates/template-vars.txt	Wed Apr 07 00:35:38 2010 +0300
@@ -28,6 +28,10 @@
 annotate      an annotated file
 entries       the entries relevant to the page
 
+url           base url of hgweb interface
+staticurl     base url for static resources
+
+
 Templates and commands:
   changelog(rev) - a page for browsing changesets
     naventry - a link for jumping to a changeset number