[whatwg/webidl] Use the Promise Objects heading in the ECMAScript reference (PR #1652)

Refer to the ECMAScript Promise Objects section by its stable heading rather than the stale section number 25.4. Use the current canonical ECMAScript URL with the existing section anchor. This is an editorial cross-reference update.

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

  https://github.com/whatwg/webidl/pull/1652

-- Commit Summary --

  * Use the Promise Objects heading in the ECMAScript reference

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/whatwg/webidl/pull/1652.patch
https://github.com/whatwg/webidl/pull/1652.diff

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