[docs] Minor improvements (#3309, #3343)

Authored by: cffswb, danielyli


Co-authored-by: Daniel Li <dan@danielyli.com>
Co-authored-by: cffswb <karte577@gmail.com>

.gitattributes

@@ -2,3 +2,5 @@
 
 Makefile* text whitespace=-tab-in-indent
 *.sh text eol=lf
+*.md diff=markdown
+*.py diff=python

README.md

@@ -70,7 +70,7 @@ yt-dlp is a [youtube-dl](https://github.com/ytdl-org/youtube-dl) fork based on t
 
 # NEW FEATURES
 
-* Based on **youtube-dl 2021.12.17 [commit/6508688](https://github.com/ytdl-org/youtube-dl/commit/6508688e88c83bb811653083db9351702cd39a6a)** and **youtube-dlc 2020.11.11-3 [commit/f9401f2](https://github.com/blackjack4494/yt-dlc/commit/f9401f2a91987068139c5f757b12fc711d4c0cee)**: You get all the features and patches of [youtube-dlc](https://github.com/blackjack4494/yt-dlc) in addition to the latest [youtube-dl](https://github.com/ytdl-org/youtube-dl)
+* Based on **youtube-dl 2021.12.17 [commit/6508688](https://github.com/ytdl-org/youtube-dl/commit/6508688e88c83bb811653083db9351702cd39a6a)** ([exceptions](https://github.com/yt-dlp/yt-dlp/issues/21)) and **youtube-dlc 2020.11.11-3 [commit/f9401f2](https://github.com/blackjack4494/yt-dlc/commit/f9401f2a91987068139c5f757b12fc711d4c0cee)**: You get all the features and patches of [youtube-dlc](https://github.com/blackjack4494/yt-dlc) in addition to the latest [youtube-dl](https://github.com/ytdl-org/youtube-dl)
 
 * **[SponsorBlock Integration](#sponsorblock-options)**: You can mark/remove sponsor sections in youtube videos by utilizing the [SponsorBlock](https://sponsor.ajay.app) API
 
@@ -783,8 +783,8 @@ You can also fork the project on github and run your fork's [build workflow](.gi
                                      containers irrespective of quality
     --no-prefer-free-formats         Don't give any special preference to free
                                      containers (default)
-    --check-formats                  Check that the selected formats are
-                                     actually downloadable
+    --check-formats                  Make sure formats are selected only from
+                                     those that are actually downloadable
     --check-all-formats              Check all formats for whether they are
                                      actually downloadable
     --no-check-formats               Do not check that the formats are actually
@@ -1748,7 +1748,7 @@ with YoutubeDL(ydl_opts) as ydl:
     ydl.download(['https://www.youtube.com/watch?v=BaW_jenozKc'])
 ```
 
-Most likely, you'll want to use various options. For a list of options available, have a look at [`yt_dlp/YoutubeDL.py`](yt_dlp/YoutubeDL.py#L195).
+Most likely, you'll want to use various options. For a list of options available, have a look at [`yt_dlp/YoutubeDL.py`](yt_dlp/YoutubeDL.py#L197).
 
 Here's a more complete example demonstrating various functionality:
 

yt_dlp/options.py

@@ -634,7 +634,7 @@ def create_parser():
     video_format.add_option(
         '--check-formats',
         action='store_const', const='selected', dest='check_formats', default=None,
-        help='Check that the selected formats are actually downloadable')
+        help='Make sure formats are selected only from those that are actually downloadable')
     video_format.add_option(
         '--check-all-formats',
         action='store_true', dest='check_formats',