Update auto_review_documentation.yml

Author: chienyuanchang

.github/workflows/auto_review_documentation.yml

@@ -41,7 +41,9 @@ jobs:
       - name: Get changed files
         id: changed-docs
         run: |
-          git diff --name-only ${{ github.event.before }} ${{ github.sha }} > changed_files.txt 
+          git diff --name-only ${{ github.event.before }} ${{ github.sha }} > changed_files.txt
+          echo "Changed files:"
+          cat changed_files.txt || echo "None"
           if grep -E "${DOC_FILE_FILTER}" changed_files.txt > changed_docs.txt; then
             echo "Filtered doc files found."
           else