[heycam/webidl] Cite RFC 2781 informatively (#439)

Fixes #438.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/439

-- Commit Summary --

  * Cite RFC 2781 informatively

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/heycam/webidl/pull/439.patch
https://github.com/heycam/webidl/pull/439.diff

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