doc: make doc testable

.github/workflows/go.yml

@@ -10,6 +10,22 @@ on:
     branches: [ "*" ]
 
 jobs:
+  fmt:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.20'
+
+      - name: Check formatting
+        run: |
+          if [ -n "$(go fmt ./...)" ]; then
+            echo "Some files are not properly formatted. Please run 'go fmt ./...'"
+            exit 1
+          fi
 
   test:
     strategy: