docs: Update configurable directories in project-structure.md

Author: aklinker1

docs/guide/essentials/project-structure.md

@@ -87,12 +87,12 @@ You can configure the following directories:
 export default defineConfig({
   // Relative to project root
   srcDir: "src",             // default: "."
+  modulesDir: "wxt-modules", // default: "modules"
   outDir: "dist",            // default: ".output"
+  publicDir: "static",       // default: "public"
 
   // Relative to srcDir
   entrypointsDir: "entries", // default: "entrypoints"
-  modulesDir: "wxt-modules", // default: "modules"
-  publicDir: "static",       // default: "public"
 })
 ```