[url] mention RFC 4395, typos, lc/uc, add comments (#21)

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/21

-- Commit Summary --

  * mention RFC 4395, typos, lc/uc, add comments

-- File Changes --

    M docs/url-problem-statement.xml (26)

-- Patch Links --

https://github.com/webspecs/url/pull/21.patch
https://github.com/webspecs/url/pull/21.diff

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