[heycam/webidl] Disallow combining LegacyWindowAlias and LegacyNamespace (#651)

This doesn't currently happen, and we don't expect it to happen in the future.

Fixes #645.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/651

-- Commit Summary --

  * Disallow combining LegacyWindowAlias and LegacyNamespace

-- File Changes --

    M index.bs (3)

-- Patch Links --

https://github.com/heycam/webidl/pull/651.patch
https://github.com/heycam/webidl/pull/651.diff

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