Added additional owners to Billing

Author: dcpena

.github/CODEOWNERS

@@ -215,7 +215,7 @@
 
 /src/content/docs/support/ @zeinjaber @ngayerie @cloudflare/pcx-technical-writing @cloudflare/customer-support
 /src/assets/images/support/ @zeinjaber @ngayerie @cloudflare/pcx-technical-writing @cloudflare/customer-support
-/src/content/docs/billing/ @simon-says
+/src/content/docs/billing/ @zeinjaber @ngayerie @simon-says @cloudflare/customer-support 
 
 # Turnstile