[url] fix ID references, fix WG element, fix AREA element, remove unneeded emp... (#19)

fix ID references, fix WG element, fix AREA element, remove unneeded empty elements
You can merge this Pull Request by running:

  git pull https://github.com/reschke/url develop

Or you can view, comment on it, or merge it online at:

  https://github.com/webspecs/url/pull/19

-- Commit Summary --

  * fix ID references, fix WG element, fix AREA element, remove unneeded empty elements

-- File Changes --

    M docs/url-problem-statement.xml (45)

-- Patch Links --

https://github.com/webspecs/url/pull/19.patch
https://github.com/webspecs/url/pull/19.diff

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https://github.com/webspecs/url/pull/19