[webvtt] Replace usage of "responsible document" (#504)

miketaylr has just created a new issue for https://github.com/w3c/webvtt:

== Replace usage of "responsible document" ==
Migration guidance at https://github.com/whatwg/html/pull/7694

Please view or discuss this issue at https://github.com/w3c/webvtt/issues/504 using your GitHub account


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Received on Tuesday, 15 March 2022 17:29:48 UTC