Update azure-government.md

Add extra note around BCDR due to FedRAMP requirements

Author: challenp

articles/ai-services/openai/azure-government.md

@@ -17,7 +17,9 @@ This article highlights the differences when using Azure OpenAI in Azure Governm
 
 ## Azure OpenAI models
 
-Learn more about the different capabilities of each model in [Azure OpenAI Service models](./concepts/models.md). The following sections show model availability by region and deployment type.
+Learn more about the different capabilities of each model in [Azure OpenAI Service models](./concepts/models.md). For customers with [Business Continuity and Disaster Recovery (BCDR) considerations](./how-to/business-continuity-disaster-recovery.md), please take careful note of the deployment types, regions, and model availability below as not all model/type combinations are available in both regions. 
+
+The following sections show model availability by region and deployment type.
 
 ### Standard deployment model availability