Refine space submission guide

app.py

@@ -416,6 +416,11 @@ def submission_guide_markdown() -> str:
 4. Make sure every checklist image path points to `target_study/images/...`.
 5. Ensure that uploaded files can be redistributed through Hugging Face before submitting.
 
+Example task in GitHub:
+[tasks/Astronomy_000](https://github.com/InternScience/ResearchClawBench/tree/main/tasks/Astronomy_000)
+
+---
+
 ## Expected ZIP Layout
 
 ```text
@@ -433,6 +438,8 @@ your_submission.zip
         └── images/
 ```
 
+---
+
 ## What The Space Checks
 
 - top-level folder structure and missing or extra files
@@ -440,10 +447,7 @@ your_submission.zip
 - file naming conventions such as `related_work/paper_000.pdf`
 - whether declared data paths actually exist
 - whether image references actually exist
-- whether old source paths or stale `/tasks/...` references remain in descriptions
-
-Example task in GitHub:
-[tasks/Astronomy_000](https://github.com/InternScience/ResearchClawBench/tree/main/tasks/Astronomy_000)
+- whether invalid source paths or stale `/tasks/...` references remain in descriptions
 """