"Multi-variant playlist", not "variant stream"

[wabiloo]

Hi,

Just a point of detail (and not critical) but I believe that the section https://github.com/globocom/m3u8?tab=readme-ov-file#variant-playlists-variable-bitrates is not technically correct. The "main" playlist is called multi-variant, not variant stream (see https://datatracker.ietf.org/doc/html/draft-pantos-hls-rfc8216bis-14#section-4.4.6.2).

It seems to me therefore that the property should ideally be called .is_multi_variant

This would however be a breaking change, and may annoy a lot of people. Maybe just adding something to the documentation to avoid confusion with the spec?