update configuration, add checkout

.github/workflows/docs.yml

@@ -6,9 +6,13 @@ on:
   pull_request:
 
 jobs:
-  spell:
-    name: Lint documentation
+  build:
+    name: Spellcheck
     runs-on: ubuntu-latest
     steps:
-      - name: GitHub Spellcheck Action
-        uses: rojopolis/[email protected]
+    # The checkout step
+    - uses: actions/checkout@v4
+    - uses: rojopolis/spellcheck-github-actions@v0
+      name: Spellcheck
+      with:
+        source_files: book/src/**/*.md reference/src/**/*.md