In our docs, annotate more items with which features they depend on?

Have a look at https://tpo.pages.torproject.net/core/doc/rust/arti/index.html : the documentation we build there lists all of our members, including those that depend on experimental-api. There is no documentation saying what functions they are!

Possible actions are:

• Change our script at https://gitlab.torproject.org/tpo/core/doc/-/blob/main/scripts/gen-api-doc.bash to run with different flags. Maybe --features=full instead of --all-features?
• Do some magic to make relevant items get documented with "Depends on an experimental-api feature" whenever they are generated?