[mediacapture-screen-share] new commits pushed by alvestrand

The following commits were just pushed by alvestrand to https://github.com/w3c/mediacapture-screen-share:

* Markup definitions to make them reusable in other specs

inspired by https://github.com/w3c/mediacapture-region/pull/41#discussion_r840922809
  by Dominique Hazael-Massieux
https://github.com/w3c/mediacapture-screen-share/commit/44a022c4e2c5bea21a582279dc451f677fb8103f

* Merge pull request #218 from w3c/respec-dfns

Markup definitions to make them reusable in other specs
  by Harald Alvestrand
https://github.com/w3c/mediacapture-screen-share/commit/f5a9152c53e9ca726cc70fdcb19e4e2da97c931d



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