docs/disko-images: fix codeblocks

docs/disko-images.md

@@ -92,29 +92,29 @@ In the this example we create a flake containing a nixos configuration for
 
 - For custom image name output, define the image name in your Disko configuration:
 
-  ```console
+  ```nix
   disko.devices.disk.<drive>.imageName = "nixos-x86_64-linux-generic-btrfs"; # Set your preferred name
   ```
 
   The image scirpt will produce `nixos-x86_64-linux-generic-btrfs.raw` instead of `<drive>.raw`.
 
 - For virtual drive use, define the image size in your Disko configuration:
 
-  ```console
+  ```nix
   disko.devices.disk.<drive>.imageSize = "32G"; # Set your preferred size
   ```
 
 - To build an image for another target platform, enable binfmt emulation support.
 
-    ```console
+  ```nix
   disko.imageBuilder.enableBinfmt = true;
   ```
 
   This requires a working binfmt setup for your target platform on your build machine. Setup instructions are available for [NixOS](https://wiki.nixos.org/wiki/NixOS_on_ARM/Building_Images#Compiling_through_binfmt_QEMU) and other distros ([Arch Linux](https://wiki.archlinux.org/title/QEMU#Chrooting_into_arm/arm64_environment_from_x86_64), [Debian](https://wiki.debian.org/QemuUserEmulation)).
 
   The relevant configuration for building `aarch64-linux` images on a `x86_64-linux` host looks like this:
 
-  ```console
+  ```nix
   disko = {
     imageBuilder = {
       enableBinfmt = true;