Re: [push-api] Clarify subscription relationships, lifecycle, and uniqueness. (#112)

>        </p>
>        <p>
> -        <a title="user agent">User agents</a> MAY support prearranged trust relationships that do
> -        not require such per-request user interfaces.
> +        When a permission is revoked, all <a title="push subscription">push subscriptions</a>
> +        created with that permission MUST be terminated.
> +      </p>
> +      <p>
> +        When a <a>service worker registration</a> is unregistered, any associated <a>push
> +        subscription</a> MUST be terminated.
> +      </p>
> +      <p>
> +        The <a>subscription id</a> of a terminated <a>push subscription</a> MUST never be reused
> +        for a new <a>push subscription</a>.

Rephrased.

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