Adds a reference to the cookie overflow warning in the dashboard (#1776)

Co-authored-by: victoria <[email protected]>

docs/backend-requests/resources/session-tokens.mdx

@@ -50,6 +50,9 @@ Claims to monitor for size limits:
 
 If you include any of these claims in your token, use caution to ensure the stored data doesn't exceed the size limit.
 
+> [!NOTE]
+> If your application encounters this issue, the Clerk Dashboard will display a warning: **"Some users are exceeding cookie size limits"**. To resolve this, update your [custom session token](/docs/backend-requests/making/custom-session-token) or the [JWT template](/docs/backend-requests/making/jwt-templates) that is referenced in the warning.
+
 ## Validate session tokens
 
 If you're using the middleware provided by our Clerk SDKs, this is all handled automatically in every request. If you're not using the middleware, you can still use the respective helpers provided by the SDKs to validate the tokens.