[extractor/common] Rephrase comment

youtube_dl/extractor/common.py

@@ -1397,8 +1397,8 @@ class InfoExtractor(object):
 
         def build_stream_name():
             # Despite specification does not mention NAME attribute for
-            # EXT-X-STREAM-INF tag (see [1] or vidio test in
-            # test_parse_m3u8_formats) it still sometimes may be present
+            # EXT-X-STREAM-INF tag it still sometimes may be present (see [1]
+            # or vidio test in TestInfoExtractor.test_parse_m3u8_formats)
             # 1. http://www.vidio.com/watch/165683-dj_ambred-booyah-live-2015
             stream_name = last_stream_inf.get('NAME')
             if stream_name: