Add comment about scenario test

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

integration/scenario_test.go

@@ -7,6 +7,9 @@ import (
 	"github.com/juanfont/headscale/integration/tsic"
 )
 
+// This file is intendet to "test the test framework", by proxy it will also test
+// some Headcsale/Tailscale stuff, but mostly in very simple ways.
+
 func IntegrationSkip(t *testing.T) {
 	t.Helper()