git-shortlog.txt: remove (-h|--help) from OPTIONS

To be consistent with the documentation of all the other commands,
remove (-h|--help) from the OPTIONS section.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-shortlog.txt

@@ -26,10 +26,6 @@ reference to the current repository.
 OPTIONS
 -------
 
--h::
---help::
-	Print a short usage message and exit.
-
 -n::
 --numbered::
 	Sort output according to the number of commits per author instead