[w3c/ServiceWorker] Fix environment reference (#1404)

As asked in https://github.com/w3c/ServiceWorker/commit/b67c4450e04e12e12777eebbb27c368a25263bc7#r33398873, the `environment` was referenced to `FileAPI` and it's good to refer to the `environment` in html spec directly.

cc @mkruisselbrink 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1404

-- Commit Summary --

  * Fix environment reference

-- File Changes --

    M docs/index.bs (2)
    M docs/index.html (28)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1404.patch
https://github.com/w3c/ServiceWorker/pull/1404.diff

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