diff: document the nobinary option
Since 3fbef7ac26f0, we have a diff.nobinary option. This is handy, but
the only way I found out about it was by looking at the release notes
for 3.1, which is not something I normally do.
--- a/mercurial/help/config.txt Tue Sep 30 23:15:56 2014 +0900
+++ b/mercurial/help/config.txt Tue Sep 30 16:59:07 2014 -0400
@@ -467,6 +467,9 @@
``git``
Use git extended diff format.
+``nobinary``
+ Omit git binary patches.
+
``nodates``
Don't include dates in diff headers.