[whatwg/webidl] Editorial: Update ECMA‑262 links (#1033)

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This updates links to [ECMA‑262](https://tc39.es/ecma262/) to use “<https://tc39.es/ecma262/>” and updates some anchors to avoid linking to `oldids`.

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(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

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

  https://github.com/whatwg/webidl/pull/1033


-- Commit Summary --

  * <a href="https://github.com/whatwg/webidl/pull/1033/commits/399f62d96588b4dfdcb5294a624c9b588e4e0359">Editorial: Update ECMA‑262 links</a>

-- File Changes --

    M index.bs (17)

-- Patch Links --

https://github.com/whatwg/webidl/pull/1033.patch

https://github.com/whatwg/webidl/pull/1033.diff


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