[cleanup] Fix typos

Changelog.md

@@ -20,7 +20,6 @@
 
 
 ### 2021.05.11
-
 * **Deprecate support for python versions < 3.6**
 * **Subtitle extraction from manifests** by [fstirlitz](https://github.com/fstirlitz). See [be6202f](https://github.com/yt-dlp/yt-dlp/commit/be6202f12b97858b9d716e608394b51065d0419f) for details
 * **Improve output template:**

yt_dlp/YoutubeDL.py

@@ -386,7 +386,7 @@ class YoutubeDL(object):
                        if True, otherwise use ffmpeg/avconv if False, otherwise
                        use downloader suggested by extractor if None.
     compat_opts:       Compatibility options. See "Differences in default behavior".
-                       Note that only format-sort, format-spec, no-live-chat, no-attach-infojson
+                       Note that only format-sort, format-spec, no-live-chat, no-attach-info-json
                        playlist-index, list-formats, no-youtube-channel-redirect
                        and no-youtube-unavailable-videos works when used via the API