fabric.save docs/examples are wrong for latest version

### 📚 Documentation

all docs seem to mention that fabric.save should be called with
`fabric.save(model.to_state_dict(), checkpoint_path)` but it seems that in latest version the params have been switched and checkpoint_path needs to be passed first

example doc: https://lightning.ai/docs/pytorch/LTS/fabric/api/fabric_methods.html


cc @lantiga @borda