[PATCH] help: document about {extras} template keyword

[Yuya Nishihara]

# HG changeset patch
# User Yuya Nishihara <yuya at tcha.org>
# Date 1269434740 -32400
# Node ID 87b74683ea3e16445ca8bb88fac96f9a15007482
# Parent  53313405b54d25f0f30ae64f9df3d33a239cb559
help: document about {extras} template keyword

diff --git a/mercurial/help/templates.txt b/mercurial/help/templates.txt
--- a/mercurial/help/templates.txt
+++ b/mercurial/help/templates.txt
@@ -34,6 +34,8 @@ keywords are usually available for templ
 :diffstat: String. Statistics of changes with the following format:
     "modified files: +added/-removed lines"
 
+:extras: List of items. The extra information of the changeset.
+
 :files: List of strings. All files modified, added, or removed by this
     changeset.