Fix link

Author: tomhamiltonstubber

_examples/custom_event_callback.html

@@ -1,7 +1,7 @@
 ---
 layout: socket_example
 title: Custom event callback enquiry form example
-permalink: /examples/basic-enquiry-form/
+permalink: /examples/custom-event-callback/
 description: Showing an example of the event callback being used with Socket
 ---
 {% highlight html %}