Edited the main document to change the link to the backlog document to a google docs.

Author: CarlosAndresRamirez

llvm/docs/QualGroup.rst

@@ -67,7 +67,7 @@ direction and tackling technical challenges. You can find our current
 discussions, challenges, and the project backlog in the following 
 document.
 
-:doc:`LLVM-Qualification-Group-Backlog <qual-wg/doc/llvm-qualgroup-backlog>` 
+`Backlog document <https://docs.google.com/document/d/10YZZ72ba09Ck_OiJaP9C4-7DeUiveaIKTE3IkaSKjzA/edit?usp=sharing>`
 
 This document serves as our central hub for all ongoing topics and will
 be updated regularly to reflect our progress. We welcome your