Apply suggestions from code review

Co-authored-by: Jeff Fisher <xirzec@xirzec.com>

sdk/keyvault/keyvault-admin/src/accessControlClient.ts

@@ -409,9 +409,7 @@ export class KeyVaultAccessControlClient {
     const f = {};
 
     for await (const page of this.listRoleDefinitionsPage(roleScope, f, options)) {
-      for (const item of page) {
-        yield item;
-      }
+      yield* page;
     }
   }