[whatwg/url] Clarify output of PSL is in A-Labels (#484)

Closes #396.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/url/pull/484

-- Commit Summary --

  * Clarify output of PSL is in A-Labels
  * assert as it's already required

-- File Changes --

    M url.bs (20)

-- Patch Links --

https://github.com/whatwg/url/pull/484.patch
https://github.com/whatwg/url/pull/484.diff

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