Several new Firestore types are missing from the API docs

[lahirumaramba]

It looks like the following Firestore types are missing in the API reference docs at https://googleapis.dev/nodejs/firestore/latest/index.html

- PartialWithFieldValue
- WithFieldValue
- Primitive
- NestedUpdateFields
- ChildUpdateFields
- AddPrefixToKeys
- UnionToIntersection
- ReadOnlyTransactionOptions

The types are defined in the TS files... they might need to be added to the corresponding JS doc files as well.

[lahirumaramba]

CC: @thebrianchen

[thebrianchen]

@lahirumaramba Thanks for flagging these!