clarify workflow through its comment

.github/workflows/node.js.yml

@@ -1,4 +1,4 @@
-# This workflow will do a clean installation of node dependencies, cache/restore them, and build the source code across different versions of node
+# This workflow will do a clean installation of node dependencies, cache/restore them, and build the source code into dist stylesheets. If these are different from the existing ones, it will automatically commit them into the current branch on push and PR events.
 # For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-nodejs
 
 name: Node.js CI