adjust help message

weed/shell/command_fs_cat.go

@@ -24,12 +24,8 @@ func (c *commandFsCat) Name() string {
 func (c *commandFsCat) Help() string {
 	return `stream the file content on to the screen
 
-	fs.cat /dir/
 	fs.cat /dir/file_name
-	fs.cat /dir/file_prefix
-	fs.cat http://<filer_server>:<port>/dir/
 	fs.cat http://<filer_server>:<port>/dir/file_name
-	fs.cat http://<filer_server>:<port>/dir/file_prefix
 `
 }