Resolve "Improve documentation of vendor options"
Closes #2793 (closed).
These changes are backed by forge experiments in https://gitlab.isc.org/isc-projects/forge/-/merge_requests/396.
This MR does not tackle vivco. There were no recent changes to vivco, so hopefully the docs are still accurate.
Tis MR does not tackle moving code from appendRequestedOptions to appendRequestedVendorOptions, or adding new unit tests, as mentioned in the issue description. I suggest a different MR or a different issue be created for that.
Edited by Andrei Pavel