[PATCH 1 of 4] rebase: mention help merge-tools in help

[timeless]

# HG changeset patch
# User timeless <timeless at mozdev.org>
# Date 1454624093 0
#      Thu Feb 04 22:14:53 2016 +0000
# Node ID 8f7715647fb5acbda814fc5fc2ba99d0dc4c4c07
# Parent  01a5143cd25f285f8c745a92986cd7186bb32c90
rebase: mention help merge-tools in help

diff --git a/hgext/rebase.py b/hgext/rebase.py
--- a/hgext/rebase.py
+++ b/hgext/rebase.py
@@ -155,6 +155,9 @@
     a named branch with two heads. You will need to explicitly specify source
     and/or destination.
 
+    If you need to use a tool to automate merge/conflict decisions, you
+    can specify one with ``--tool``, see :hg:`help merge-tools`.
+
     If a rebase is interrupted to manually resolve a conflict, it can be
     continued with --continue/-c or aborted with --abort/-a.