[PATCH 2 of 4] gpg: mention undocumented options

[Matt Mackall]

# HG changeset patch
# User Matt Mackall <mpm at selenic.com>
# Date 1435271757 18000
#      Thu Jun 25 17:35:57 2015 -0500
# Node ID 8908ef1715644db25d3d05aa8848e1bebd17e3b2
# Parent  1190e5ca97d5f4688270f5c1d73e14f43d0332b3
gpg: mention undocumented options

diff -r 1190e5ca97d5 -r 8908ef171564 hgext/gpg.py
--- a/hgext/gpg.py	Thu Jun 25 17:34:53 2015 -0500
+++ b/hgext/gpg.py	Thu Jun 25 17:35:57 2015 -0500
@@ -217,6 +217,9 @@
     If no revision is given, the parent of the working directory is used,
     or tip if no revision is checked out.
 
+    The ``gpg.cmd`` config setting can be used to specify the command
+    to run. A default key can be specified with ``gpg.key``.
+
     See :hg:`help dates` for a list of formats valid for -d/--date.
     """