[heycam/webidl] Note what "present" means in ES close to its definition (#329)

Also change how it's linked to a little bit.

See https://github.com/whatwg/fetch/issues/513 for the motivation.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/329

-- Commit Summary --

  * Note what "present" means in ES close to its definition

-- File Changes --

    M index.bs (9)

-- Patch Links --

https://github.com/heycam/webidl/pull/329.patch
https://github.com/heycam/webidl/pull/329.diff

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https://github.com/heycam/webidl/pull/329