Fix stray reference

Author: frivoal

index.bs

@@ -3086,7 +3086,7 @@ Types of Technical Reports</h3>
 
 <dt>Notes
 <dd>
-Groups can also publish documents as [=W3C Notes=] and [=W3C Statements=],
+Groups can also publish documents as [=Group Notes=] and [=W3C Statements=],
 typically either to document information
 other than technical specifications,
 such as use cases motivating a specification