net/http: fix a long test after CL 185117

The net/url error in question now quotes the URL, so update the expected
output string.

While at it, also update a comment in httputil, though that doesn't
affect any test.

Fixes #33910.

Change-Id: I0981f528b24337c2952ef60c0db3b7ff72d72110
Reviewed-on: https://go-review.googlesource.com/c/go/+/192078
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/net/http/httputil/reverseproxy_test.go

@@ -436,7 +436,7 @@ func TestReverseProxyCancelation(t *testing.T) {
 	}
 	if err == nil {
 		// This should be an error like:
-		// Get http://127.0.0.1:58079: read tcp 127.0.0.1:58079:
+		// Get "http://127.0.0.1:58079": read tcp 127.0.0.1:58079:
 		//    use of closed network connection
 		t.Error("Server.Client().Do() returned nil error; want non-nil error")
 	}

src/net/http/transport_test.go

@@ -2289,7 +2289,7 @@ func TestTransportCancelRequestInDial(t *testing.T) {
 	got := logbuf.String()
 	want := `dial: blocking
 canceling
-Get = Get http://something.no-network.tld/: net/http: request canceled while waiting for connection
+Get = Get "http://something.no-network.tld/": net/http: request canceled while waiting for connection
 `
 	if got != want {
 		t.Errorf("Got events:\n%s\nWant:\n%s", got, want)