fix(docs): update path-alias example from app to src (#3733)

docs/start/framework/react/path-aliases.md

@@ -12,13 +12,13 @@ By default, TanStack Start does not include path aliases. However, you can easil
   "compilerOptions": {
     "baseUrl": ".",
     "paths": {
-      "~/*": ["app/*"]
+      "~/*": ["./src/*"]
     }
   }
 }
 ```
 
-In this example, we've defined the path alias `~/*` that maps to the `app/*` directory. This means that you can now import files from the `app` directory using the `~` prefix.
+In this example, we've defined the path alias `~/*` that maps to the `./src/*` directory. This means that you can now import files from the `src` directory using the `~` prefix.
 
 After updating your `tsconfig.json` file, you'll need to install the `vite-tsconfig-paths` plugin to enable path aliases in your TanStack Start project. You can do this by running the following command: