remove invalid user

Author: Danny Tundwe (from Dev Box)

.github/CODEOWNERS

@@ -56,7 +56,7 @@
 /specification/cdn/ @yunhemsft @jessicl-ms @rrahulms @ChenglongLiu @Ptnan7 @zhuofudeng
 
 # PRLabel: %Network - Edge Actions
-/specification/cdn/resource-manager/Microsoft.Cdn/EdgeActions/ @tundwed @anamikanupur @mattmccreesh
+/specification/cdn/resource-manager/Microsoft.Cdn/EdgeActions/ @tundwed @anamikanupur
 
 # PRLabel: %Cognitive Services
 /specification/cognitiveservices/ @rkuthala @MattGal