[w3c/ServiceWorker] WindowOrWorkerGlobalScope is a mixin (#1309)

...and so extensions should use [`partial interface mixin`](https://heycam.github.io/webidl/#partial-interface-mixin) rather than `interface mixin`.

See also https://github.com/whatwg/html/pull/3650
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1309

-- Commit Summary --

  * WindowOrWorkerGlobalScope is a mixin

-- File Changes --

    M docs/index.bs (2)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1309.patch
https://github.com/w3c/ServiceWorker/pull/1309.diff

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