fix redundant sentance

Author: tcaldwell-x

fundamentals/authentication/oauth-2-0/ios.mdx

@@ -49,7 +49,7 @@ If the X app is not detected, use the standard authorization URL (`https://x.com
 
 ## Step 3: Construct the Authorization Start Flow URL
 
-Build the URL using the endpoint `https://x.com/i/oauth2_start_flow` (or `https://x.com/i/oauth2_start_flow` for compatibility). Include all standard OAuth 2.0 parameters.
+Build the URL using the endpoint `https://x.com/i/oauth2_start_flow`. Include all standard OAuth 2.0 parameters.
 
 Required parameters:
 - `client_id`: Your app's Client ID from the X Developer Portal.