chore: remove double header

Author: DanielRivers

src/content/docs/authenticate/manage-authentication/user-pools.mdx

@@ -28,8 +28,6 @@ ai-summary: >
     Comprehensive guide to Organization User Pools - a multi-tenant user management feature that isolates user identities within organizations for secure B2B environments.
 ---
 
-# Organization User Pools
-
 Organization User Pools is a powerful multi-tenant user management feature that isolates user identities within specific organizations. This feature is essential for B2B applications where you need to maintain separate user pools across different client organizations while allowing the same email addresses or usernames to exist across organizations.
 
 ## What are Organization User Pools?