Merge branch 'sb/merge-commit-msg-hook'

As "git commit" to conclude a conflicted "git merge" honors the
commit-msg hook, "git merge" that records a merge commit that
cleanly auto-merges should, but it didn't.
* sb/merge-commit-msg-hook (2017-09-22) 1 commit
(merged to 'next' on 2017-09-25 at 096e0502a8)
+ Documentation/githooks: mention merge in commit-msg hook

Add documentation for a topic that has recently graduated to the
'master' branch.

* sb/merge-commit-msg-hook:
  Documentation/githooks: mention merge in commit-msg hook

Documentation/githooks.txt

@@ -127,11 +127,10 @@ help message found in the commented portion of the commit template.
 commit-msg
 ~~~~~~~~~~
 
-This hook is invoked by 'git commit', and can be bypassed
-with the `--no-verify` option.  It takes a single parameter, the
-name of the file that holds the proposed commit log message.
-Exiting with a non-zero status causes the 'git commit' to
-abort.
+This hook is invoked by 'git commit' and 'git merge', and can be
+bypassed with the `--no-verify` option.  It takes a single parameter,
+the name of the file that holds the proposed commit log message.
+Exiting with a non-zero status causes the command to abort.
 
 The hook is allowed to edit the message file in place, and can be used
 to normalize the message into some project standard format. It