[w3c/push-api] Add note about single push service per user agent. (#244)

This is a follow up to https://github.com/w3c/push-api/issues/243. The PR adds a note explaining that there is only one push service per user agent and provides some reasoning for the design decision. Our engineers spent a fair bit of time trying to understand if there was a way to change the push service and this text would have saved them some time.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/push-api/pull/244

-- Commit Summary --

  * Add note about single push service per user agent

-- File Changes --

    M index.html (7)

-- Patch Links --

https://github.com/w3c/push-api/pull/244.patch
https://github.com/w3c/push-api/pull/244.diff

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https://github.com/w3c/push-api/pull/244