[mediacapture-screen-share] Pull Request: Remove responsible doc

miketaylr has just submitted a new pull request for https://github.com/w3c/mediacapture-screen-share:

== Remove responsible doc ==
cf. https://github.com/whatwg/html/pull/7694

See https://github.com/w3c/mediacapture-screen-share/pull/210


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