QAT file linking issue in the quantization_sampling.ipynb file

The quantization_sampling collab file has a link to the qualtization_aware_traning.md file but the markdown file is not present in the docs folder, so this PR adds a markdown file

<img width="976" alt="image" src="https://github.com/user-attachments/assets/cbfa5cc1-80fc-407e-87e2-fa9b5763c653" />
image
