add PR number

Author: Pouyanpi

CHANGELOG.md

@@ -37,7 +37,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 ### 📚 Documentation
 
 - Restore deleted configuration files ([#963](https://github.com/NVIDIA/NeMo-Guardrails/issues/963))
-- Add content safety tutorial
+- Add content safety tutorial ([#1042](https://github.com/NVIDIA/NeMo-Guardrails/issues/1042))
 - Revise reasoning model info ([#1062](https://github.com/NVIDIA/NeMo-Guardrails/issues/1062))
 - Consider new GS experience ([#1005](https://github.com/NVIDIA/NeMo-Guardrails/issues/1005))