checkout: implement "-" abbreviation, add docs and tests

diff --git a/t/t7604-merge-custom-message.sh b/t/t7604-merge-custom-message.sh
index 6081677d234f1fcb88b6b9160f707ebf0274f38a..de977c5e2f0b270c57bbea9daaf8e22eefdf8560 100755 (executable)
--- a/t/t7604-merge-custom-message.sh
+++ b/t/t7604-merge-custom-message.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-test_description='git-merge
+test_description='git merge
 
 Testing merge when using a custom message for the merge commit.'