remove beta tag

docs/products/opensearch/howto/opensearch-dashboard-multi_tenancy.rst

@@ -1,4 +1,4 @@
-Set up OpenSearch® Dashboard multi-tenancy |beta|
+Set up OpenSearch® Dashboard multi-tenancy
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 Aiven for OpenSearch® provides support for multi-tenancy through OpenSearch Security Dashboard. Multi-tenancy in OpenSearch Security enables multiple users or groups to securely access the same OpenSearch cluster while maintaining their distinct permissions and data access levels. With multi-tenancy, each tenant has its own isolated space for working with indexes, visualizations, dashboards, and other OpenSearch objects, ensuring tenant-specific data and resources are protected from unauthorized access.