v7 breaking changes guide is missing notes about debounce

[OliverJAsh]

The changelog describes a breaking change to debounce but this is not mentioned in the guide.

https://github.com/ReactiveX/rxjs/blob/master/CHANGELOG.md#:~:text=debounce%3A%20the%20observable%20returned%20by%20the%20debounce%20

debounce: the observable returned by the debounce operator's duration selector must emit a next notification to end the duration. Complete notifications no longer end the duration.

This broke our application in a non-trivial way so I think it's worth mentioning in the guide. WDYT?

[cartant]

Yes. That's an oversight. And it's not just that operator. All notifiers now have to emit a next notification.

[cartant]

I've opened two PRs that bring all of the v7 breaking changes listed in the CHANGELOG into the summary document. Thanks for opening the issue.