refs and cleanup

Author: SimonCropp

.github/workflows/on-push-do-docs.yml

@@ -5,7 +5,7 @@ jobs:
   docs:
     runs-on: windows-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Run MarkdownSnippets
       run: |
         dotnet tool install --global MarkdownSnippets.Tool