[w3c/push-api] Clarify that push messages can come from anywhere (#239)

Fixes #211
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/push-api/pull/239

-- Commit Summary --

  * Clarify that push messages can come from anywhere

-- File Changes --

    M index.html (6)

-- Patch Links --

https://github.com/w3c/push-api/pull/239.patch
https://github.com/w3c/push-api/pull/239.diff

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https://github.com/w3c/push-api/pull/239