Merge branch 'sg/doc-test-must-fail-args'

Devdoc update. * sg/doc-test-must-fail-args: t: document 'test_must_fail ok=<signal-name>'

Junio C Hamano committed Feb 27, 2018 at 10:33 UTC e3eb4050272e790ee9c7d9e08e44b34322387da6

No changes.