fix: YAML syntax error in execution workflow

Remove extra indentation in multiline string that was causing parse error on line 518.

Author: guchenhe

.github/workflows/sync_docs_execute.yml

@@ -514,12 +514,12 @@ jobs:
             const translationPrNumber = ${{ steps.create-translation-pr.outputs.translation_pr_number }};
             
             const backLinkComment = `## 🔗 Linked to Original PR
-            
+
 This translation PR was automatically created for the English documentation changes in **PR #${prNumber}**.
 
 ### 📝 Original Changes
 - **Original PR**: #${prNumber}
-- **Type**: English documentation updates
+- **Type**: English documentation updates  
 - **Auto-translation**: This PR contains the corresponding translations
 
 ### 🔄 Synchronization