Update ZMQ Message Reference

ZMQ-Message-Reference.md

@@ -67,7 +67,7 @@ Reply Messages:
 
 ## 'estimatedTime'
 
-Data is a JSON scan request (see 'scanRequest' below). For example:
+Data is a JSON scan request (see '[scanRequest](ZMQ-Message-Reference#scanRequest)' below). For example:
 ```
     msg = ['estimatedTime',   Scan_Request ]
 ```