treewide: add bool type to enable options, or make use of mkEnableOption

Add missing type information to manually specified enable options or replace them by mkEnableOption where appropriate.

nixos/modules/services/databases/clickhouse.nix

@@ -11,10 +11,7 @@ with lib;
 
     services.clickhouse = {
 
-      enable = mkOption {
-        default = false;
-        description = "Whether to enable ClickHouse database server.";
-      };
+      enable = mkEnableOption "ClickHouse database server";
 
     };
 

nixos/modules/services/databases/firebird.nix

@@ -40,12 +40,7 @@ in
 
     services.firebird = {
 
-      enable = mkOption {
-        default = false;
-        description = ''
-          Whether to enable the Firebird super server.
-        '';
-      };
+      enable = mkEnableOption "the Firebird super server";
 
       package = mkOption {
         default = pkgs.firebirdSuper;

nixos/modules/services/databases/memcached.nix

@@ -18,12 +18,7 @@ in
 
     services.memcached = {
 
-      enable = mkOption {
-        default = false;
-        description = "
-          Whether to enable Memcached.
-        ";
-      };
+      enable = mkEnableOption "Memcached";
 
       user = mkOption {
         default = "memcached";

nixos/modules/services/databases/mongodb.nix

@@ -29,12 +29,7 @@ in
 
     services.mongodb = {
 
-      enable = mkOption {
-        default = false;
-        description = "
-          Whether to enable the MongoDB server.
-        ";
-      };
+      enable = mkEnableOption "the MongoDB server";
 
       package = mkOption {
         default = pkgs.mongodb;

nixos/modules/services/databases/virtuoso.nix

@@ -13,10 +13,7 @@ with lib;
 
     services.virtuoso = {
 
-      enable = mkOption {
-        default = false;
-        description = "Whether to enable Virtuoso Opensource database server.";
-      };
+      enable = mkEnableOption "Virtuoso Opensource database server";
 
       config = mkOption {
         default = "";