[whatwg/url] Correct and add to PSL examples (#472)

The ASCII prefix is xn--, not xn-. Also add an example where the public suffix is null as callers used to forget about it.

Closes #471.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/url/pull/472

-- Commit Summary --

  * Correct and add to PSL examples

-- File Changes --

    M url.bs (20)

-- Patch Links --

https://github.com/whatwg/url/pull/472.patch
https://github.com/whatwg/url/pull/472.diff

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