Update or remove tsd-jsdoc

As part of the build process, [CesiumJS generates TypeScript definitions based off our jsdoc comments](https://github.com/CesiumGS/cesium/pull/8878).

While we're generally pretty meticulous about having accurate documentation, there are a few instances of invalid jsdoc that have slipped through. The `build-ts` scripts, which converts our jsdoc to TypeScript definitions, has recently been spitting out a ton of warnings indicating probable issues with our meta tags.

There is a helpful list of common pitfalls the link above, including:

> * Use proper `@enum` notation for enums.
> * Use proper `@namespace` notation for static classes.
> * Use proper `@function` notation for standalone functions.
> * Fix Promise markup to actually include the type in all cases, i.e. `Promise` => `Promise` or `Promise`.

This list likely covers most of the warnings. We should fix theses to ensure we have accurate documentation and accurate TYpeScript definitions.