Review asynchronous updates page

[dichotommy]

This page has been the victim of a lot of content bloat over the last year and needs to be reviewed. Should be made more brief, focused, clear.

Note that this feature is changing in v0.25, so this may happen as part of that release.

[maryamsulemani97]

Rename Asynchronous operations to include the word “tasks”, e.g. “Tasks and asynchronous processes”.

[maryamsulemani97]

We could move the “Summarized task object” table to the API reference overview page. Under the “Response body” section