[w3c/permissions] Editorial: mark various permissions at risk (#259)

Marked all single engine things "at risk".


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<a href="https://pr-preview.s3.amazonaws.com/w3c/permissions/pull/259.html" title="Last updated on Jul 28, 2021, 9:06 AM UTC (b81c73e)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/permissions/259/3af5370...b81c73e.html" title="Last updated on Jul 28, 2021, 9:06 AM UTC (b81c73e)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/permissions/pull/259

-- Commit Summary --

  * Editorial: mark various permissions at risk

-- File Changes --

    M index.bs (78)

-- Patch Links --

https://github.com/w3c/permissions/pull/259.patch
https://github.com/w3c/permissions/pull/259.diff

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