MixedPrecisionOps Documentation

### Feature Idea

It would be really useful with a proper writeup and documentation of the changes to loading fp8 model.
Because as it is now, commits like this #11000 one completely broke loaders (such as my [ComfyUI_Hybrid-Scaled_fp8-Loader](https://github.com/silveroxides/ComfyUI_Hybrid-Scaled_fp8-Loader)) that was trying to adhere to using ComfyUI Core loading while using mixed precision before the new ops. These breaking changes was done rather abruptly and there have been several [others affected](https://github.com/comfyanonymous/ComfyUI/commit/43071e3de3780f984a46549e90935a0bf405e9df#commitcomment-172090695). Related to #10912 but what I request is a proper writeup and documentation as there is none and if the format is to be adopted there needs to be proper documentation for it.

### Existing Solutions

_No response_

### Other

_No response_