Revert changes to summarize code feature's status

doc/user/project/merge_requests/duo_in_merge_requests.md

@@ -21,7 +21,7 @@ GitLab Duo is designed to provide contextually relevant information during the l
 
 {{< details >}}
 
-- Status: Experiment
+- Status: Beta
 - LLM: Anthropic [Claude 3.5 Sonnet](https://console.cloud.google.com/vertex-ai/publishers/anthropic/model-garden/claude-3-5-sonnet)
 
 {{< /details >}}