Add extra line about failover types and configuration

Author: johndowns

articles/reliability/reliability-storage-blob.md

@@ -133,6 +133,8 @@ Azure Blob Storage supports three types of failover that are intended for differ
 
 - **Microsoft-managed failover:** In exceptional situations, Microsoft might initiate failover for all GRS storage accounts in a region. However, Microsoft-managed failover is a last resort and is expected to only be performed after an extended period of outage. You shouldn't rely on Microsoft-managed failover.
 
+Geo-redundant storage accounts can use any of these failover types. You don't need to preconfigure a storage account to use any of the failover types ahead of time.
+
 ### Region support
 
 Geo-redundant storage, as well as customer initiated failover and failback are available in all [Azure paired regions](./regions-paired.md) that support general-purpose v2 storage accounts.