refactor: clarify stage description for multiple topics in CreateTopics API

Update the stage description for handling multiple topics in a single CreateTopics request to improve clarity. The title has been modified to specify "single CreateTopics request," ensuring better understanding of the functionality being documented.

Author: ryan-gang

final-stages.md

@@ -21,5 +21,5 @@ Stage CT6: CreateTopics with Valid Parameters (Success Case)
 - Successfully create single topic with valid parameters
 - Core success functionality
 
-Stage CT7: Multiple topics in single request
+Stage CT7: Multiple topics in single CreateTopics request
 - Handle multiple topics in a single request