mpv: [housekeeping] Update summary and description

[TraceyC77]

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Name

mpv

Version

No response

Link to the release notes or announcement.

https://github.com/mpv-player/mpv

Reason for updating

Whenever mpv releases another version, we should update the summary and description. They are out of date. The new ones are more meaningful to the average user.

Summary

mpv is a free (as in freedom) media player for the command line. It supports a wide variety of media file formats, audio and video codecs, and subtitle types.

Description from the man pages

mpv is a media player based on MPlayer and mplayer2. It supports a wide variety of video file formats, audio and video codecs, and subtitle types. Special input URL types are available to read input from a variety of sources other than disk files. Depending on platform, a variety of different video and audio output methods are supported.