[w3c/ServiceWorker] Use Web IDL's new-ish interface mixins concept (#1252)

WebIDL recently introduced dedicated syntax for mixins [1]. So, this
change replaces the existing `implements` with `includes` as per the new
concept.

[1] https://github.com/heycam/webidl/commit/45e8173d40ddff8dcf81697326e094bcf8b92920
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1252

-- Commit Summary --

  * Use Web IDL's new-ish interface mixins concept

-- File Changes --

    M docs/index.bs (2)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1252.patch
https://github.com/w3c/ServiceWorker/pull/1252.diff

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