adjust usage

go/weed/upload.go

@@ -29,7 +29,7 @@ func init() {
 }
 
 var cmdUpload = &Command{
-	UsageLine: "upload -server=localhost:9333 file1 [file2 file3]\n upload -server=localhost:9333 -dir=one_directory",
+	UsageLine: "upload -server=localhost:9333 file1 [file2 file3]\n upload -server=localhost:9333 -dir=one_directory -include=*.pdf",
 	Short:     "upload one or a list of files",
 	Long: `upload one or a list of files, or batch upload one whole folder recursively.
   It uses consecutive file keys for the list of files.