[w3c/permissions] Editorial: cleanup Permissions model (PR #355)

Tried to clean up some of the definitions. 

Moved lifetimes into the model section. 

Moved "Express permission" into the Permissions section.


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<a href="https://pr-preview.s3.amazonaws.com/w3c/permissions/pull/355.html" title="Last updated on Feb 4, 2022, 6:32 AM UTC (9f3fe76)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/permissions/355/01ae676...9f3fe76.html" title="Last updated on Feb 4, 2022, 6:32 AM UTC (9f3fe76)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/permissions/pull/355

-- Commit Summary --

  * Editorial: cleanup Permissions model

-- File Changes --

    M index.html (61)

-- Patch Links --

https://github.com/w3c/permissions/pull/355.patch
https://github.com/w3c/permissions/pull/355.diff

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