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