[cleanup, docs] Misc cleanup

Closes #2828, closes #2734, closes #2802, closes #2937

yt_dlp/extractor/periscope.py

@@ -33,7 +33,7 @@ class PeriscopeBaseIE(InfoExtractor):
 
         return {
             'id': broadcast.get('id') or video_id,
-            'title': self._live_title(title) if is_live else title,
+            'title': title,
             'timestamp': parse_iso8601(broadcast.get('created_at')),
             'uploader': uploader,
             'uploader_id': broadcast.get('user_id') or broadcast.get('username'),