[heycam/webidl] Only [Global] platform objects are immutable prototype (#596)

Fixing a typo introduced in #494

cc @tobie 
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/596

-- Commit Summary --

  * Only [Global] platform objects are immutable prototype

-- File Changes --

    M index.bs (3)

-- Patch Links --

https://github.com/heycam/webidl/pull/596.patch
https://github.com/heycam/webidl/pull/596.diff

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