Update TypeDoc to 0.23.28 (#1090)

* Update TypeDoc to 0.23.28

* Make changes so updated TypeDoc is backwards compatible.

The most major change that impacts our documentation generation is the
`Comment` node has been updated to be a list of partial text fragments.

We instead used to use a first line `shortText`, and remainder in
`text`.
This commit "fakes" that setup by doing the processing manually.

* Regenerate Lit API docs with changes applied.

* Fix documentation generating in parameters.

For example see parameters in:
/docs/api/ReactiveElement/#ReactiveElement.requestUpdate

* Fix TypeDoc generation of reflected types and accessors.

Tested by checking `observedAttributes` docs and `updateComplete`

Author: AndrewJakubowicz