correct section title (#790)

Author: superojla

content/guides/docgen/docgen-getting-started.md

@@ -62,7 +62,7 @@ After you generate the token, you can use it in cURL
 or other clients, such as [Postman][postman], to make
 calls.
 
-## Using webhooks 
+## Use webhooks 
 
 You can create webhooks to monitor Doc Gen events and automate your business process or workflow.