[w3c/ServiceWorker] Clean up prose about waitUntil on install and activate events (#1248)

The behaviors of the install/activate events' extended lifetime promises
are normatively specified in the Install algorithm and Activate
algorithm, respectively. This changes the informative prose in the
waitUntil() section to a note.

Fixes #1227.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1248

-- Commit Summary --

  * Clean up prose about waitUntil on install and activate events

-- File Changes --

    M docs/index.bs (5)
    M docs/v1/index.bs (5)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1248.patch
https://github.com/w3c/ServiceWorker/pull/1248.diff

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