Bug 1362272 Comment 17 Edit History

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This was already mostly documented, but I've polished things up and done the rest of the remaining bits:

* Cleaned up and improved [PromiseRejectionEvent](https://developer.mozilla.org/en-US/docs/Web/API/PromiseRejectionEvent)
* JavaScript Guide section [Promise rejection events](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Using_promises#Promise_rejection_events) already exists
* All other related content reviewed and looks good.
* Added to Firefox 68 for developers
* Submitted [BCD PR 44386](https://github.com/mdn/browser-compat-data/pull/4386) with changes needed there
This was already mostly documented, but I've polished things up and done the rest of the remaining bits:

* Cleaned up and improved [PromiseRejectionEvent](https://developer.mozilla.org/en-US/docs/Web/API/PromiseRejectionEvent)
* JavaScript Guide section [Promise rejection events](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Using_promises#Promise_rejection_events) already exists
* All other related content reviewed and looks good.
* Added to Firefox 69 for developers
* Submitted [BCD PR 44386](https://github.com/mdn/browser-compat-data/pull/4386) with changes needed there

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