[w3c/permissions] Remove Permission Registry provisional note (#232)

Also WebKit implements these permissions:
https://bugs.webkit.org/show_bug.cgi?id=221399


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<a href="https://pr-preview.s3.amazonaws.com/anssiko/permissions/pull/232.html" title="Last updated on Mar 25, 2021, 3:03 PM UTC (2de2a13)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/permissions/232/388ee1c...anssiko:2de2a13.html" title="Last updated on Mar 25, 2021, 3:03 PM UTC (2de2a13)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/permissions/pull/232

-- Commit Summary --

  * Remove Permission Registry provisional note

-- File Changes --

    M index.bs (7)

-- Patch Links --

https://github.com/w3c/permissions/pull/232.patch
https://github.com/w3c/permissions/pull/232.diff

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