While here, also change grammatically poor "three dash lines" to
"three-dash line".
Suggested-by: Stefan Beller <sbeller@google.com> Signed-off-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>