git.c: make usage match manual page

Reorder option list in command-line usage to match the manual page.
Also make it less than 80-characters wide.
Signed-off-by: NKevin Bracey <kevin@bracey.fi>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

git.c

@@ -6,10 +6,10 @@
 #include "run-command.h"
 
 const char git_usage_string[] =
-	"git [--version] [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n"
+	"git [--version] [--help] [-c name=value]\n"
+	"           [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n"
 	"           [-p|--paginate|--no-pager] [--no-replace-objects] [--bare]\n"
 	"           [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]\n"
-	"           [-c name=value] [--help]\n"
 	"           <command> [<args>]";
 
 const char git_more_info_string[] =