Fix typo

Azure key vault -> Azure Key Vault

Author: changeworld

articles/healthcare-apis/fhir/customer-managed-keys.md

@@ -17,7 +17,7 @@ Customer-managed keys (CMK) are encryption keys that you create and manage in yo
 
 Follow security best practices and rotate keys often. Keys used with the FHIR service must be rotated manually. When you rotate a key, update the version of the existing key or set a new encryption key from a different storage location. Always make sure to keep existing keys enabled when adding new keys because they're still needed to access the data that was encrypted with them.  
 
-To rotate the key by generating a new version of the key, use the 'az keyvault key rotate' command. For more information, see [Azure key vault rotate command](/cli/azure/keyvault/key)
+To rotate the key by generating a new version of the key, use the 'az keyvault key rotate' command. For more information, see [Azure Key Vault rotate command](/cli/azure/keyvault/key)
 
 ## Update the FHIR service after changing a managed identity