rcodezero: fix documentation

[MikeAT]

Documentation fix for rcodezero driver

Description

This PR fixes the link to the rcodezero API documentation and removes the unimplemented methodes from the generated documentation

Status

done

Checklist (tick everything that applies)

• [x] Code linting (required, can be done after the PR checks)
• [x] Documentation
• [x] Tests
• [x] ICLA (required for bigger changes)