Incorrect comment in LearnOpentk coordinates chapter

<img width="996" height="507" alt="Image" src="https://github.com/user-attachments/assets/d692aea0-7eed-43d4-85af-d5f376a2f4e6" />
This comment is copied directly from learnopengl, but opentk has left to right multiplication convention, this may confuse anyone reading the code