fix comment

packages/docusaurus-plugin-google-gtag/src/gtag.ts

@@ -16,10 +16,9 @@ const clientModule: ClientModule = {
   onRouteDidUpdate({location, previousLocation}) {
     if (previousLocation && location.pathname !== previousLocation.pathname) {
       // Normally, the document title is updated in the next tick due to how
-      // `react-helmet-async` updates it.
-      // We want to send to gtag the current document title so we use 
-      // setTimeout to put the function on the callback stack to be executed
-      // on the next tick.
+      // `react-helmet-async` updates it. We want to send the current document's
+      // title to gtag instead of the old one's, so we use `setTimeout` to defer
+      // execution to the next tick.
       // See: https://github.com/facebook/docusaurus/issues/7420
       setTimeout(() => {
         // Always refer to the variable on window in case it gets overridden