[w3c/push-api] Use the correct terminology for secure contexts (#203)

Fixes #202 

This also removes the reference to `document` for `PushManager.subscribe()`, which is incorrect for usage from a worker.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/push-api/pull/203

-- Commit Summary --

  * Use the correct terminology for secure contexts.

-- File Changes --

    M index.html (31)

-- Patch Links --

https://github.com/w3c/push-api/pull/203.patch
https://github.com/w3c/push-api/pull/203.diff

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