[doc] Minor improvements

Closes #3518, Closes #3560

yt_dlp/YoutubeDL.py

@@ -409,12 +409,14 @@ class YoutubeDL:
     sleep_interval_subtitles: Number of seconds to sleep before each subtitle download
     listformats:       Print an overview of available video formats and exit.
     list_thumbnails:   Print a table of all thumbnails and exit.
-    match_filter:      A function that gets called with the info_dict of
-                       every video.
-                       If it returns a message, the video is ignored.
-                       If it returns None, the video is downloaded.
-                       If it returns utils.NO_DEFAULT, the user is interactively
-                       asked whether to download the video.
+    match_filter:      A function that gets called for every video with the signature
+                       (info_dict, *, incomplete: bool) -> Optional[str]
+                       For backward compatibility with youtube-dl, the signature
+                       (info_dict) -> Optional[str] is also allowed.
+                       - If it returns a message, the video is ignored.
+                       - If it returns None, the video is downloaded.
+                       - If it returns utils.NO_DEFAULT, the user is interactively
+                         asked whether to download the video.
                        match_filter_func in utils.py is one example for this.
     no_color:          Do not emit color codes in output.
     geo_bypass:        Bypass geographic restriction via faking X-Forwarded-For

yt_dlp/extractor/youtube.py

@@ -287,7 +287,7 @@ class YoutubeBaseInfoExtractor(InfoExtractor):
         # invidious-redirect websites
         r'(?:www\.)?redirect\.invidious\.io',
         r'(?:(?:www|dev)\.)?invidio\.us',
-        # Invidious instances taken from https://github.com/iv-org/documentation/blob/master/Invidious-Instances.md
+        # Invidious instances taken from https://github.com/iv-org/documentation/blob/master/docs/instances.md
         r'(?:www\.)?invidious\.pussthecat\.org',
         r'(?:www\.)?invidious\.zee\.li',
         r'(?:www\.)?invidious\.ethibox\.fr',

yt_dlp/options.py

@@ -814,11 +814,11 @@ def create_parser():
         }, help=(
             'Name or path of the external downloader to use (optionally) prefixed by '
             'the protocols (http, ftp, m3u8, dash, rstp, rtmp, mms) to use it for. '
-            'Currently supports native, %s (Recommended: aria2c). '
+            f'Currently supports native, {", ".join(list_external_downloaders())}. '
             'You can use this option multiple times to set different downloaders for different protocols. '
             'For example, --downloader aria2c --downloader "dash,m3u8:native" will use '
             'aria2c for http/ftp downloads, and the native downloader for dash/m3u8 downloads '
-            '(Alias: --external-downloader)' % ', '.join(list_external_downloaders())))
+            '(Alias: --external-downloader)'))
     downloader.add_option(
         '--downloader-args', '--external-downloader-args',
         metavar='NAME:ARGS', dest='external_downloader_args', default={}, type='str',