[mediacapture-main] new commits pushed by jan-ivar

The following commits were just pushed by jan-ivar to https://github.com/w3c/mediacapture-main:

* Mark up IDL from constrainable patterns as non-normative

The Capabitilies, Settings, Constraints and ConstraintSet dictionataries are not meant to be directly implemented - they document the Constrainable pattern.

To avoid having them be considered as part of the normative surface of the spec, they're marked-up with the example class - similar to what we do with ConstrainablePattern.

This in particular helps with automatically extracted IDL fragments as done by webref / reffy https://github.com/w3c/webref/
  by Dominique Hazael-Massieux
https://github.com/w3c/mediacapture-main/commit/09ef367f4fe82d66819996ace1cf7e2dc39b81aa

* Address PR feedback

https://github.com/w3c/mediacapture-main/pull/769#pullrequestreview-579247720
  by Dominique Hazael-Massieux
https://github.com/w3c/mediacapture-main/commit/b348d7bfb97dc99561be8ab500e453d5c2335850

* Merge pull request #769 from w3c/settings-constraints-idl

Mark up IDL from constrainable patterns as non-normative
  by Jan-Ivar Bruaroey
https://github.com/w3c/mediacapture-main/commit/670bdad9e11178f0fe67a54d8faa11389b20c726



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