[w3c/push-api] Remove the note that suggests subscribe()'s step order does not matter (PR #413)

And move a number of steps to happen before we go in parallel to make it easier to introduce user activation checks in the future.

We also make a couple of editorial changes that more closely aligns the language with Infra.

This helps with #346.


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

  https://github.com/w3c/push-api/pull/413

-- Commit Summary --

  * Remove the note that suggests subscribe()'s step order does not matter

-- File Changes --

    M index.html (75)

-- Patch Links --

https://github.com/w3c/push-api/pull/413.patch
https://github.com/w3c/push-api/pull/413.diff

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