Add explanation of using the bluezFull package in nixos documentation.

nixos/modules/services/hardware/bluetooth.nix

@@ -25,9 +25,14 @@ in {
         type = types.package;
         default = pkgs.bluez;
         defaultText = "pkgs.bluez";
-        example = "pkgs.bluez.override { enableMidi = true; }";
+        example = "pkgs.bluezFull";
         description = ''
           Which BlueZ package to use.
+
+          <note><para>
+            Use the <literal>pkgs.bluezFull</literal> package to enable all
+            bluez plugins.
+          </para></note>
         '';
       };