slight syntax change

It seems the syntax to specify acceleration type has changed. On a recent nixos rebuild I got the following error:

The option definition `services.ollama.acceleration' no longer has any effect; please remove it. Set `services.ollama.package` to one of `pkgs.ollama[,-vulkan,-rocm,-cuda,-cpu]` instead.

This compiles, but I haven't tested yet whether acceleration works correctly:

   services.ollama = {    
       enable = true;
       package = pkgs.ollama-rocm;
   };
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