remove these docs from here

dns.go

@@ -60,19 +60,7 @@
 //      in, err := c.Exchange(m1, "127.0.0.1:53")
 //
 // An asynchronous query is also possible, setting up is more elaborate then
-// a synchronous query. The Basic use pattern is:
-// 
-//      dns.HandleQuery(".", handler)
-//      dns.ListenAndQuery(nil, nil)
-//      c.Do(m1, "127.0.0.1:53")
-//      // Do something else
-//      r := <- DefaultReplyChan
-//      // r is of type Exchange:
-//      // * r.Reply is the answer
-//      // * r.Request is the original request
-//      // * r.Rtt is the round trip time
-//      // * r.RemoteAddr is the net.Addr were the request was sent to
-//      // * r.Error is the error (if any)
+// a synchronous query. 
 package dns
 
 import (