Update gen_index.py

Author: jtmims

tools/run-MDTF/scripts/gen_index.py

@@ -23,6 +23,6 @@
             file_path = os.path.join(pod_dir, f'{p}.html')
             if os.path.exists(file_path):
                 print(p)
-                index_file.write(f'<a href="{file_path}"> {p} </a>')
+                index_file.write(f'<a href="{file_path}"> {p} </a> <br>')
 
 index_file.close()