update custom verifier code snippet to show redirect

app/en/guides/user-facing-agents/secure-auth-production/page.mdx

@@ -157,11 +157,17 @@ If the user's ID matches the ID specified at the start of the authorization flow
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 ```ts
-// Either redirect to result.next_uri, or render a success page:
+// Wait for the auth flow to be completed by the user:
 const authResponse = await client.auth.waitForCompletion(result.auth_id);
 
 if (authResponse.status === "completed") {
-  return "Thanks for authorizing!";
+  // Either redirect to a URL, or render your own success page:
+  return new Response(null, {
+    status: 303,
+    headers: {
+      Location: "https://your-app.com/auth/success",
+    },
+  });
 } else {
   return "Something went wrong. Please try again.";
 }
@@ -171,11 +177,17 @@ if (authResponse.status === "completed") {
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 ```python
-# Either redirect to result.next_uri, or render a success page:
+from starlette.responses import Response
+
+# Wait for the auth flow to be completed by the user:
 auth_response = await client.auth.wait_for_completion(result.auth_id)
 
 if auth_response.status == "completed":
-    return "Thanks for authorizing!"
+    # Either redirect to a URL, or render your own success page:
+    return Response(
+        status_code=303,
+        headers={"Location": "https://your-app.com/auth/success"}
+    )
 else:
     return "Something went wrong. Please try again."
 ```