changes namespace reference to id

Author: ZPain8464

content/docs/capabilities/enterprise-api.mdx

@@ -58,7 +58,7 @@ This doc assumes:
 
 [**Service Accounts**](/docs/capabilities/service-accounts) created in any Namespace other than **Global** will include a reference to that Namespace ID. A service account created in a non-global Namespace will generate a **User ID** that follows this format:
 
-`{user-id}@{namespace-reference}.pomerium`
+`{user-id}@{namespace-id}.pomerium`
 
 You must specify the entire **User ID** when using the service account. For example: