[w3c/permissions] chore(perm interface): Fix return value handling (#143)

Unlike the other methods defined in this section, `revoke` is defined as
a series of steps to be run in parallel. Returning a value is
meaningless in this context. Instead, the result of the operation should
be communicated via the Promise instance that is defined and
synchronously returned prior to the parallelized steps.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/permissions/pull/143

-- Commit Summary --

  * chore(perm interface): Fix return value handling

-- File Changes --

    M index.bs (8)

-- Patch Links --

https://github.com/w3c/permissions/pull/143.patch
https://github.com/w3c/permissions/pull/143.diff

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