Trivial documentation fix for func ListenAndServe().

R=go-dev
APPROVED=gri
DELTA=1  (1 added, 0 deleted, 0 changed)
OCL=35817
CL=35819

src/pkg/http/server.go

@@ -550,6 +550,7 @@ func Serve(l net.Listener, handler Handler) os.Error {
 //	package main
 //
 //	import (
+//		"http";
 //		"io";
 //	)
 //