scripts: use "git foo" not "git-foo"

We want to make sure that people who copy & paste code would see
fewer instances of "git-foo".  The use of these dashed forms have
been discouraged since v1.6.0 days.

Signed-off-by: Michael Forney <mforney@mforney.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/git-merge-resolve.sh b/git-merge-resolve.sh
index c9da747..343fe7b 100755
--- a/git-merge-resolve.sh
+++ b/git-merge-resolve.sh
@@ -45,7 +45,7 @@
 	exit 0
 else
 	echo "Simple merge failed, trying Automatic merge."
-	if git-merge-index -o git-merge-one-file -a
+	if git merge-index -o git-merge-one-file -a
 	then
 		exit 0
 	else