fix

Author: wxiaoguang

routers/api/v1/repo/file.go

@@ -911,6 +911,8 @@ func GetContentsExt(ctx *context.APIContext) {
 	// summary: The extended "contents" API, to get file metadata and/or content, or list a directory.
 	// description: It guarantees that only one of the response fields is set if the request succeeds.
 	//              Users can pass "includes=file_content" or "includes=lfs_metadata" to retrieve more fields.
+	//              "includes=file_content" only works for single file, if you need to retrieve file contents in batch,
+	//              use "file-contents" API after listing the directory.
 	// produces:
 	// - application/json
 	// parameters: