[webidl] Fix DOMException-related nits. (#36)

You can merge this Pull Request by running:

  git pull https://github.com/Ms2ger/webidl exn

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

  https://github.com/heycam/webidl/pull/36

-- Commit Summary --

  * Fix the link to the error names table.
  * Fix a typo.

-- File Changes --

    M index.html (4)
    M index.xml (4)

-- Patch Links --

https://github.com/heycam/webidl/pull/36.patch
https://github.com/heycam/webidl/pull/36.diff

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https://github.com/heycam/webidl/pull/36