feat(remix): Add Vite custom server usage instructions. (#8576)

src/platforms/javascript/guides/remix/manual-setup.mdx

@@ -208,6 +208,17 @@ import { createRequestHandler } from "@remix-run/express";
 const createSentryRequestHandler =
   wrapExpressCreateRequestHandler(createRequestHandler);
 
-// Use createSentryRequestHandler like you would with createRequestHandler
 app.all("*", createSentryRequestHandler(/* ... */));
 ```
+
+The function returned by `wrapExpressCreateRequestHandler` accepts the build object as its first parameter. So if your boilerplate code passes the argument as a function, you need to update the usage. For example, if you're using Vite, you need to await the build loader before passing it to the wrapped handler.
+
+```diff {filename: server/index.ts}
+    wrapExpressCreateRequestHandler(createRequestHandler)({
+      build: vite
+-       ? () => unstable_loadViteServerBuild(vite)
++       ? await unstable_loadViteServerBuild(vite)
+      : await import(BUILD_DIR + "/index.js"),
+      ...
+    })
+```