net/http: fix reference to URL.RawPath in docs

R=go.peter.90, n13m3y3r, gustavo
CC=golang-dev
https://golang.org/cl/5655053

src/pkg/net/http/doc.go

@@ -60,7 +60,7 @@ Handle and HandleFunc add handlers to DefaultServeMux:
 	http.Handle("/foo", fooHandler)
 
 	http.HandleFunc("/bar", func(w http.ResponseWriter, r *http.Request) {
-		fmt.Fprintf(w, "Hello, %q", html.EscapeString(r.URL.RawPath))
+		fmt.Fprintf(w, "Hello, %q", html.EscapeString(r.URL.Path))
 	})
 
 	log.Fatal(http.ListenAndServe(":8080", nil))