Make sure the manual page about builtins is kept updated
Add to the builtin proc macro a feature to export the manual to a file in manual/builtins. When generating the manual for gitlab, take those and generate a always up-to-date page.
Add to the builtin proc macro a feature to export the manual to a file in manual/builtins. When generating the manual for gitlab, take those and generate a always up-to-date page.