Update data/metadata.csv

data/metadata.csv

@@ -1,4 +1,4 @@
-file_name.png,text
+file_name,text
 output_detection_image_0.png,Player A is standing at the baseline and player B is standing at the baseline.
 output_detection_image_1.png,Player A is standing at the baseline and player B is standing behind the baseline.
 output_detection_image_2.png,Player A is standing at the net of the tennis field and player B is standing at the net of the tennis field.