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nixos/manual/manpages: add description on previewing manpage files I was a bit lost with the new manpage format and it took me some time to find the corresponding pull request by @pennae with a very helpful comment of @alyssais that mentioned this: https://github.com/NixOS/nixpkgs/pull/213256#issuecomment-1407713215 As @pennae noted, the file path is only a fallback if it cannot be resolved in the man database Co-authored-by: pennae <82953136+pennae@users.noreply.github.com>