[whatwg/webidl] Update DOMException language to reflect standardized stack accessor (PR #1578)

Since DOMException objects have [[ErrorData]], the Error.prototype.stack accessor from the Error Stack Accessor proposal naturally applies to them. Update the language to reflect that stack is now a specified accessor property rather than a nonstandard property that implementations "should" expose.

See https://github.com/tc39/proposal-error-stack-accessor/issues/9 and https://github.com/tc39/proposal-error-stack-accessor/issues/8

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

  https://github.com/whatwg/webidl/pull/1578

-- Commit Summary --

  * Update DOMException language to reflect standardized stack accessor

-- File Changes --

    M index.bs (8)

-- Patch Links --

https://github.com/whatwg/webidl/pull/1578.patch
https://github.com/whatwg/webidl/pull/1578.diff

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