- generate AVAILABILITY manpage sections automatically - for consistent
wording
- allows us to double-check against other documumentation (symbols-in-versions
etc)
- enables proper automation/scripting based on this data
- lots of them were wrong or missing in the manpages
- several of them repeated (sometimes mismatching) backend support info
Add test 1488 to verify "added-in" version numbers against
symbols-in-versions.
Closes#14217
- use imperative form
- use lowercase
- no period
- unify some phrases
- fix curl_multi_socket and curl_multi_socket_all to keep their own
descriptions
Closes#14062
