Thanks for reviewing this Yury. Here is a new patch:

* Drop the “native” term; distinguish by referring to “async def” where necessary
* Add generator version of display_date() coroutine example
* Change chained coroutine example over to “async def” and updated sequence diagram
* Change one other example over (then I ran into Issue 24495)
* Include Yury’s new documentation for @types.coroutine from Issue 24325