add new lines to end of files and modify python script to do the same

Author: Blargian

docs/en/chdb/guides/table_of_contents.json

@@ -27,4 +27,4 @@
         "title": "Using a clickhouse-local database",
         "slug": "/en/chdb/guides/clickhouse-local"
     }
-]
+]

docs/en/cloud/changelogs/table_of_contents.json

@@ -15,4 +15,4 @@
         "title": "v24.8 Changelog for Cloud",
         "slug": "/en/changelogs/24.8"
     }
-]
+]

scripts/autogenerate_table_of_contents.py

@@ -33,10 +33,10 @@ def main():
                 json_array.append(result)
 
     json_array = sorted(json_array, key=lambda x: x["title"])
-
+    json_array.append("\n")
     with open("table_of_contents.json", "w") as f:
         json.dump(json_array, f, indent=4)
-
+        f.write('\n')
 
 if __name__ == "__main__":
     main()