Since release 20.09 `rngd.enable` defaults to false, so this setting is redundant. Also fix the `qemu-quest` section of the manual that incorrectly claimed that `rngd` was enabled.
*** 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.