Added resend payload instructions

Author: D-K-P

docs/examples/resend-email-sequence.mdx

@@ -68,5 +68,17 @@ export const emailSequence = task({
     //etc...
   },
 });
+```
 
-```
+### Testing
+
+You can test this task by running it with the following payload:
+
+```json
+{
+  "userId": "123",
+  // Replace with your test email
+  "email": "<your-test-email>",
+  "name": "Alice Testington"
+}
+```