nit: fix comment

Author: andrewlock

tracer/src/Datadog.Trace/DiagnosticListeners/AspNetCoreDiagnosticObserver.cs

@@ -568,10 +568,10 @@ private void OnRoutingEndpointMatched(object arg)
                 // But instead we re-extract them in the MVC endpoint as these are MVC
                 // constructs. this is likely marginally less efficient, but simplifies the
                 // already complex logic in the MVC handler
-                // Overwrite the route in the parent span
                 trackingFeature.ResourceName = resourceName;
                 if (isFirstExecution)
                 {
+                    // Overwrite the route in the parent span
                     rootSpan.ResourceName = resourceName;
                     tags.AspNetCoreRoute = normalizedRoute;
                 }