Update CODEOWNERS

Updated code owners for my domains (subscription, admin, accounts, billing)

Author: sarahsanders-docker

.github/CODEOWNERS

@@ -21,7 +21,7 @@
 
 /content/manuals/engine/ @dvdksn
 
-/content/manuals/subscription/ @aevesdocker
+/content/manuals/subscription/ @sarahsanders-docker
 
 /content/manuals/security/ @aevesdocker
 
@@ -31,3 +31,9 @@
 
 /content/manuals/registry/ @dvdksn
 
+/content/manuals/admin/ @sarahsanders-docker
+
+/content/manuals/billing/ @sarahsanders-docker
+
+/content/manuals/accounts/ @sarahsanders-docker
+