docs - update release notes with known issue

Author: ishaan-jaff

docs/my-website/release_notes/v1.63.11-stable/index.md

@@ -34,6 +34,10 @@ This release will be live on 03/16/2025
 
 <!-- <Image img={require('../../img/release_notes/v16311_release.jpg')} /> -->
 
+## Known Issues
+- 🚨 Known issue on Azure OpenAI - We don't recommend upgrading if you use Azure OpenAI. This version failed our Azure OpenAI load test
+
+
 ## Docker Run LiteLLM Proxy
 
 ```