Update CODEOWNERS (#1703)

Co-authored-by: LocalStack Bot <localstack-bot@users.noreply.github.com>

Author: localstack-bot

CODEOWNERS

@@ -96,7 +96,7 @@
 /content/en/user-guide/aws/efs/ @pinzon
 
 # eks
-/content/en/user-guide/aws/eks/ @dfangl
+/content/en/user-guide/aws/eks/ @dfangl @simonrw
 
 # elasticache
 /content/en/user-guide/aws/elasticache/ @thrau @giograno @silv-io
@@ -143,9 +143,6 @@
 # managedblockchain
 /content/en/user-guide/aws/managedblockchain/ @HarshCasper @pinzon
 
-# mediastore
-/content/en/user-guide/aws/mediastore/ @simonrw
-
 # memorydb
 /content/en/user-guide/aws/memorydb/ @silv-io