net/http: fix typographical error in transport.go

Change-Id: I5f9de0daa3c18ecd7d6cd30ea13d147e227b3550
GitHub-Last-Rev: 5eabcbd91f8988c8f74f5bd11fb0e79cb85a9451
GitHub-Pull-Request: golang/go#29454
Reviewed-on: https://go-review.googlesource.com/c/155920Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/net/http/transport.go

@@ -134,7 +134,7 @@ type Transport struct {
 	//
 	// DialContext runs concurrently with calls to RoundTrip.
 	// A RoundTrip call that initiates a dial may end up using
-	// an connection dialed previously when the earlier connection
+	// a connection dialed previously when the earlier connection
 	// becomes idle before the later DialContext completes.
 	DialContext func(ctx context.Context, network, addr string) (net.Conn, error)
 
@@ -142,7 +142,7 @@ type Transport struct {
 	//
 	// Dial runs concurrently with calls to RoundTrip.
 	// A RoundTrip call that initiates a dial may end up using
-	// an connection dialed previously when the earlier connection
+	// a connection dialed previously when the earlier connection
 	// becomes idle before the later Dial completes.
 	//
 	// Deprecated: Use DialContext instead, which allows the transport