[whatwg/storage] Editorial: Minor Permissions-related edits (PR #129)

- Consistently refer to "persistent-storage" as a <a>powerful feature</a>
- Use <a>getting the current permission state</a> in the permission revocation
algorithm.
- Remove reference to powerful feature flags (as there are none anymore)
- Whitespace tweaks


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  https://github.com/whatwg/storage/pull/129

-- Commit Summary --

  * Editorial: Minor Permissions-related edits

-- File Changes --

    M storage.bs (18)

-- Patch Links --

https://github.com/whatwg/storage/pull/129.patch
https://github.com/whatwg/storage/pull/129.diff

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