Grammar error

When looking for an enumerator like GFP_KERNEL it says defined as *a* enumerator instead of *an* enumerator. I apologize if this is not an important issue but I wanted to pointed out just in case. Thank you for reading

<img width="1920" height="994" alt="Image" src="https://github.com/user-attachments/assets/57223d78-01cb-4a91-8e7e-0c7ded0769b3" />