[whatwg/xhr] Editorial: move feature policy integration section (#204)

It's part of XMLHttpRequest, not ProgressEvent.

Fixes #199.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/204

-- Commit Summary --

  * Editorial: move feature policy integration section

-- File Changes --

    M xhr.bs (12)

-- Patch Links --

https://github.com/whatwg/xhr/pull/204.patch
https://github.com/whatwg/xhr/pull/204.diff

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