[heycam/webidl] Add a section on overloads vs. union/optional (#426)

Fixes #307.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/426

-- Commit Summary --

  * Add a section on overloads vs. union/optional

-- File Changes --

    M index.bs (201)

-- Patch Links --

https://github.com/heycam/webidl/pull/426.patch
https://github.com/heycam/webidl/pull/426.diff

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