[Feature Request] LLM Docs: Do not use `?` for pptional properties

[lsmith77]

Is your feature request related to a problem? Please describe.
Right now optional properties are marked as ? in the generated docs. IMHO this is not sufficiently clear.

Describe the solution you'd like
Instead write Optional

Describe alternatives you've considered
Add some configuration to define what to use. Obviously I can use search and replace but this can be forgotten when re-running the generation.

Additional context
https://discord.com/channels/1035538056146595961/1417448193012273232