[PATCH 1 of 9] mdiff.diffopts: add doc comment for nobinary

[Siddharth Agarwal]

# HG changeset patch
# User Siddharth Agarwal <sid0 at fb.com>
# Date 1415863184 28800
#      Wed Nov 12 23:19:44 2014 -0800
# Node ID c69f0be399be0f7044196415792e04b7946bfd35
# Parent  14df598f1c13fa7fb04daf652efb94bd0f55e8c9
mdiff.diffopts: add doc comment for nobinary

diff --git a/mercurial/mdiff.py b/mercurial/mdiff.py
--- a/mercurial/mdiff.py
+++ b/mercurial/mdiff.py
@@ -25,6 +25,7 @@
     showfunc enables diff -p output
     git enables the git extended patch format
     nodates removes dates from diff headers
+    nobinary ignores binary files
     ignorews ignores all whitespace changes in the diff
     ignorewsamount ignores changes in the amount of whitespace
     ignoreblanklines ignores changes whose lines are all blank