Document positive variant of commit and merge option "--no-verify"

This documents "--verify" option of the commands. It can be used to re-enable
the hooks disabled by an earlier "--no-verify" in command-line.

Signed-off-by: Alexander Riesen <raa.lkml@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/t7504-commit-msg-hook.sh b/t/t7504-commit-msg-hook.sh
index 4e75925..bba58f0 100755
--- a/t/t7504-commit-msg-hook.sh
+++ b/t/t7504-commit-msg-hook.sh
@@ -133,6 +133,14 @@
 
 '
 
+test_expect_success '-n followed by --verify with failing hook' '
+
+	echo "even more" >> file &&
+	git add file &&
+	test_must_fail git commit -n --verify -m "even more"
+
+'
+
 test_expect_success '--no-verify with failing hook (editor)' '
 
 	echo "more stuff" >> file &&