net/http: annotate equivalent h2 tests for h1

Change-Id: Ic639443d4a8536dd54c5b0cf5a9b6d1474448f77
Reviewed-on: https://go-review.googlesource.com/17593Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/net/http/serve_test.go

@@ -1139,6 +1139,7 @@ var serverExpectTests = []serverExpectTest{
 
 // Tests that the server responds to the "Expect" request header
 // correctly.
+// http2 test: TestServer_Response_Automatic100Continue
 func TestServerExpect(t *testing.T) {
 	defer afterTest(t)
 	ts := httptest.NewServer(HandlerFunc(func(w ResponseWriter, r *Request) {