Hi Paul,
Flora is in an experimental state, and its development is on hold. Its future is unknown at this moment.
When I read the official docs on plugins, none of the code samples show how to do it in Flora.
If you mean code samples in the IntelliJ Platform SDK docs, there is no plan to update them with the information about how it would be done in Flora. Flora is intended to be used for simpler project-specific features, while SDK docs are focused on developing regular, more advanced plugins.