[whatwg/xhr] Drop the “Feature Policy integration” section (#322)

See https://github.com/whatwg/xhr/pull/321 and https://github.com/whatwg/xhr/pull/295



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<a href="https://whatpr.org/xhr/322.html" title="Last updated on Mar 25, 2021, 9:59 AM UTC (af32043)">Preview</a> | <a href="https://whatpr.org/xhr/322/82ff852...af32043.html" title="Last updated on Mar 25, 2021, 9:59 AM UTC (af32043)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/322


-- Commit Summary --

  * Drop the “Feature Policy integration” section

-- File Changes --

    M xhr.bs (8)

-- Patch Links --

https://github.com/whatwg/xhr/pull/322.patch

https://github.com/whatwg/xhr/pull/322.diff


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