update as pytorch 1.12 is no longer nightly

docs/guides/apple_silicon.md

@@ -121,11 +121,6 @@ conda activate pytorch
 python -m pip install torch torchvision torchaudio
 ```
 
-As the `1.12` version is currently a nightly build, the impatient can install it with:
-```bash
-python -m pip install --pre torch torchvision torchaudio --extra-index-url https://download.pytorch.org/whl/nightly/cpu
-```
-
 ??? info "Making PyTorch use the GPU"
     The PyTorch integration with Metal is not as seamless as the TensorFlow one, and just like with any other accelerators, PyTorch requires you to explicitly set the `device` for calculations.
     To use the Apple Silicon GPU, one has to specify the device as `mps` (Metal Performance Shaders) in either the `torch.device` constructor, or when creating tensors: