anchor.diff:          environment = mkOption {
             type = with types; attrsOf str;
             default = {};
  -          description = "Environment variables to set for this container.";
  +          description = lib.mdDoc "Environment variables to set for this container.";
             example = literalExpression ''
               {
                 DATABASE_HOST = "db.example.com";
  
positive.code:     backend = mkOption {
        type = types.enum [ "podman" "docker" ];
        default = if versionAtLeast config.system.stateVersion "22.05" then "podman" else "docker";
        description = "The underlying Docker implementation to use.";
      };
  
      containers = mkOption {
        default = {};
        type = types.attrsOf (types.submodule containerOptions);
        description = "OCI (Docker) containers to run as systemd services.";
      };
  
    };
  
negative.code: 
          entrypoint = mkOption {
            type = with types; nullOr str;
            description = lib.mdDoc "Override the default entrypoint of the image.";
            default = null;
            example = "/bin/my-app";
          };
  