http: fix typo in URL.String doc comment.
R=adg
CC=golang-dev
https://golang.org/cl/4485046
diff --git a/src/pkg/http/url.go b/src/pkg/http/url.go
index 0fc0cb2..d7ee14e 100644
--- a/src/pkg/http/url.go
+++ b/src/pkg/http/url.go
@@ -449,7 +449,7 @@
//
// There are redundant fields stored in the URL structure:
// the String method consults Scheme, Path, Host, RawUserinfo,
-// RawQuery, and Fragment, but not Raw, RawPath or Authority.
+// RawQuery, and Fragment, but not Raw, RawPath or RawAuthority.
func (url *URL) String() string {
result := ""
if url.Scheme != "" {
