docs: add opening backticks for usage segment (#13924)

Signed-off-by: Leong Bryan <leong.bryan@gmail.com>

Author: LeongBryan

docs/content/en/working_with_findings/finding_deduplication/deduplication_tuning_os.md

@@ -112,7 +112,7 @@ docker compose exec uwsgi /bin/bash -c "python manage.py dedupe --hash_code_only
 ```
 
 Help/usage:
-
+```
 options:
   --parser PARSER       List of parsers for which hash_code needs recomputing
                         (defaults to all parsers)