Add instructions to commit template.

New users can be irritated by the git status text in their editor.
Let's give them a short help.
Signed-off-by: NMartin Waitz <tali@admingilde.org>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

git-commit.sh

@@ -626,6 +626,9 @@ fi
 if test -z "$no_edit"
 then
 	{
+		echo ""
+		echo "# Please enter the commit message for your changes."
+		echo "# (Comment lines starting with '#' will not be included)"
 		test -z "$only_include_assumed" || echo "$only_include_assumed"
 		run_status
 	} >>"$GIT_DIR"/COMMIT_EDITMSG