Documentation: "git reset <tree-ish> <pathspec>" takes a tree-ish, not tree-sh

Reported-By: Ibrahim M. Ghazal <imgx64@gmail.com>
Signed-off-by: Stefan Beller <stefanbeller@googlemail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-reset.txt

@@ -9,7 +9,7 @@ SYNOPSIS
 --------
 [verse]
 'git reset' [-q] [<tree-ish>] [--] <paths>...
-'git reset' (--patch | -p) [<tree-sh>] [--] [<paths>...]
+'git reset' (--patch | -p) [<tree-ish>] [--] [<paths>...]
 'git reset' [--soft | --mixed | --hard | --merge | --keep] [-q] [<commit>]
 
 DESCRIPTION