docs: typo fix and add npm scripts document

docs/install-local-documentation.md

@@ -1,6 +1,8 @@
-# Manage local documentation
+# Manage Local Documentation
 
-Documents from Vutron can be viewed in the local environment through the VitePress viewer.
+Documents from `Vutron` can be viewed in the local environment through the VitePress viewer.
+
+This function works only when the entire project is cloned. If you created the project with `npm init`, the `docs` folder is not included.
 
 Since VitePress and related plugin packages are configured to be selectively installed, they cannot be installed with `npm i`.