better notes

Author: AdiSai

fern/assistants/assistant-hooks.mdx

@@ -157,6 +157,10 @@ Handle customer speech interruptions in a similar way:
 }
 ```
 
+<Note>
+Use `"oneOf": ["pipeline-error"]` as a catch-all filter for any pipeline-related error reason.
+</Note>
+
 ## Common use cases
 
 - Transfer to a human agent on errors
@@ -251,5 +255,5 @@ Add this hook configuration to your assistant to trigger Slack notifications on
 ```
 
 <Note>
-Use `"oneOf": ["pipeline-error"]` as a catch-all filter for any pipeline-related error reason.
+Replace `<your-slack-webhook-url>` with your actual Slack webhook URL and `<your-serverless-function-url>` with your serverless function endpoint.
 </Note>