Update unity_catalog.md

Author: melvynator

docs/use-cases/data_lake/unity_catalog.md

@@ -11,9 +11,9 @@ show_related_blogs: true
 doc_type: 'guide'
 ---
 
-import ExperimentalBadge from '@theme/badges/ExperimentalBadge';
+import BetaBadge from '@theme/badges/BetaBadge';
 
-<ExperimentalBadge/>
+<BetaBadge/>
 
 :::note
 Integration with the Unity Catalog works for managed and external tables.