terminfo(5) is a library to describe the capabilities of a terminal.
As such, it also has a code for all the special function keys that are on a keyboard. The new terminfo(5) manpage lists all these keys, but not their function. You have to research what the single keys do and insert the description into the list.
This bug has also been reported as "lib/47090 - terminfo(5) lacks descriptions for key definitions".