[whatwg/xhr] Retitle to “Permissions Policy integration” (#321)

...and change the section-heading ID but also retain an anchor for the feature-policy-integration so that we don’t break any existing links.


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<a href="https://whatpr.org/xhr/321.html" title="Last updated on Mar 24, 2021, 5:29 PM UTC (02ca251)">Preview</a> | <a href="https://whatpr.org/xhr/321/450c432...02ca251.html" title="Last updated on Mar 24, 2021, 5:29 PM UTC (02ca251)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/321


-- Commit Summary --

  * Retitle to “Permissions Policy integration”

-- File Changes --

    M xhr.bs (2)

-- Patch Links --

https://github.com/whatwg/xhr/pull/321.patch

https://github.com/whatwg/xhr/pull/321.diff


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