markdown can't represent the difference without another extension and both the html manual and the manpage render them the same, so keeping the distinction is not very useful on its own. with the distinction removed we can automatically convert many options that use <code> tags to markdown. the manpage remains unchanged, html manual does not render differently (but class names on code tags do change from "code" to "literal").
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.