[w3c/push-api] Clarify encryption key lifetime and intention (#224)

Fixes #212
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/push-api/pull/224

-- Commit Summary --

  * Clarify encryption key lifetime and intention

-- File Changes --

    M index.html (10)

-- Patch Links --

https://github.com/w3c/push-api/pull/224.patch
https://github.com/w3c/push-api/pull/224.diff

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https://github.com/w3c/push-api/pull/224