filter-branch: make the usage string fit on 80 chars terminals.

It used to be a single, huge line, badly wrapped by xterm.
Signed-off-by: NMatthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

git-filter-branch.sh

@@ -97,12 +97,12 @@ set_ident () {
 	echo "case \"\$GIT_${uid}_NAME\" in \"\") GIT_${uid}_NAME=\"\${GIT_${uid}_EMAIL%%@*}\" && export GIT_${uid}_NAME;; esac"
 }
 
-USAGE="[--env-filter <command>] [--tree-filter <command>] \
-[--index-filter <command>] [--parent-filter <command>] \
-[--msg-filter <command>] [--commit-filter <command>] \
-[--tag-name-filter <command>] [--subdirectory-filter <directory>] \
-[--original <namespace>] [-d <directory>] [-f | --force] \
-[<rev-list options>...]"
+USAGE="[--env-filter <command>] [--tree-filter <command>]
+            [--index-filter <command>] [--parent-filter <command>]
+            [--msg-filter <command>] [--commit-filter <command>]
+            [--tag-name-filter <command>] [--subdirectory-filter <directory>]
+            [--original <namespace>] [-d <directory>] [-f | --force]
+            [<rev-list options>...]"
 
 OPTIONS_SPEC=
 . git-sh-setup