[w3c/permissions] Add requirements for specifying Powerful Features (PR #362)

Can link to this from the registry as part of the registration instructions...


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### :boom: Error: 500 Internal Server Error :boom: ###

[PR Preview](https://github.com/tobie/pr-preview#pr-preview) failed to build. _(Last tried on Feb 14, 2022, 5:35 AM UTC)_.

<details>
<summary>More</summary>


PR Preview relies on a number of web services to run. There seems to be an issue with the following one:

:rotating_light: [Spec Generator](https://www.w3.org/2015/labs/) - Spec Generator is the web service used to build specs that rely on ReSpec.

:link: [Related URL](https://labs.w3.org/spec-generator/?type=respec&url=https%3A%2F%2Frawcdn.githack.com%2Fw3c%2Fpermissions%2F5a804b9f0aaee1a7b4b81c2620ed1c1d06102cc0%2Findex.html%3FisPreview%3Dtrue)

```
📡 HTTP Error 429: https://rawcdn.githack.com/w3c/permissions/5a804b9f0aaee1a7b4b81c2620ed1c1d06102cc0/index.html

```

_If you don't have enough information above to solve the error by yourself (or to understand to which web service the error is related to, if any), please [file an issue](https://github.com/tobie/pr-preview/issues/new?title=Error%20not%20surfaced%20properly&body=See%20w3c/permissions%23362.)._
</details>

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/permissions/pull/362


-- Commit Summary --

  * Add requirements for specifying Powerful Features

-- File Changes --

    M index.html (36)

-- Patch Links --

https://github.com/w3c/permissions/pull/362.patch

https://github.com/w3c/permissions/pull/362.diff


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