docs: fix deploy.sh example with correct commands (#2269) [ci skip]

Author: NoelDeMartin

docs/guide/deployment.md

@@ -58,10 +58,10 @@ If you are using the PWA plugin, your app must be served over HTTPS so that [Ser
     set -e
 
     # build
-    npm run docs:build
+    npm run build
 
     # navigate into the build output directory
-    cd docs/.vuepress/dist
+    cd dist
 
     # if you are deploying to a custom domain
     # echo 'www.example.com' > CNAME