doc: fix confusing reference in net.md

PR-URL: nodejs#12247
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>

doc/api/net.md

@@ -793,7 +793,8 @@ Passing `timeout` as an option will call [`socket.setTimeout()`][] after the soc
 The `connectListener` parameter will be added as a listener for the
 [`'connect'`][] event once.
 
-Here is an example of a client of the previously described echo server:
+Following is an example of a client of the echo server described
+in the [`net.createServer()`][] section:
 
 ```js
 const net = require('net');