net: fix misleading package comment example

Fixes #8607

LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/146470043

src/net/net.go

@@ -32,7 +32,6 @@ The Listen function creates servers:
 		conn, err := ln.Accept()
 		if err != nil {
 			// handle error
-			continue
 		}
 		go handleConnection(conn)
 	}