docs: add new troubleshooting guides for Query and middlewares (#12214)

www/apps/resources/app/troubleshooting/_sections/api-routes/middleware-file-name.mdx

@@ -0,0 +1,5 @@
+A common mistake when creating middlewares is naming the file `middleware.ts` rather than `middlewares.ts`.
+
+If your middleware isn't registered correctly, make sure you've created the middleware file at `src/api/middlewares.ts`.
+
+Learn more in the [Middleware](!docs!/learn/fundamentals/api-routes/middlewares) documentation.