[whatwg/webidl] Remove the word "instances" from DOMException custom bindings (PR #1187)

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This prevents a possible confusion from the word "instance", as it theoretically can sound like each instance should own the property.

Also, the paragraph mentions "native Error objects" so it's natural to match that and say "DOMException objects".

See also https://github.com/whatwg/webidl/issues/1186#issuecomment-1241401986.

- [x] At least two implementers are interested (and none opposed): (N/A?)
- [x] [Tests](https://github.com/web-platform-tests/wpt/blob/a370aad338d6ed743abb4d2c6ae84a7f1058558c/webidl/ecmascript-binding/es-exceptions/DOMException-custom-bindings.any.js#L104-L119) already just checks the exposure, not how it is exposed.
- [x] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed: (N/A)

(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/1187

-- Commit Summary --

  * Remove the word "instances" from DOMException custom bindings

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/whatwg/webidl/pull/1187.patch
https://github.com/whatwg/webidl/pull/1187.diff

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