Add clarity around LRS

The LRS statement was missing information on a temporary failure, and was the phrasing of "server rack or drive" failures wasn't particularly clear.  

Both of these changes are directly from customer interaction with an S500 customer.

Author: MikeBazMSFT

articles/storage/common/storage-redundancy.md

@@ -50,7 +50,7 @@ Data in an Azure Storage account is always replicated three times in the primary
 
 Locally redundant storage (LRS) replicates the data within your storage accounts to one or more Azure availability zones located in the primary region of your choice. Although there is no option to choose your preferred availability zone, Azure may move or expand LRS accounts across zones to improve load balancing. LRS provides at least 99.999999999% (11 nines) durability of objects over a given year. Visit the [What are Azure availability zones](../../reliability/availability-zones-overview.md) article to learn more about availability zone reliability.
 
-LRS is the lowest-cost redundancy option and offers the least durability compared to other options. LRS protects your data against server rack and drive failures. However, if a disaster such as fire or flooding occurs within the data center, all replicas of a storage account using LRS might be lost or unrecoverable. To mitigate this risk, Microsoft recommends using [zone-redundant storage](#zone-redundant-storage) (ZRS), [geo-redundant storage](#geo-redundant-storage) (GRS), or [geo-zone-redundant storage](#geo-zone-redundant-storage) (GZRS).
+LRS is the lowest-cost redundancy option and offers the least durability compared to other options. LRS protects your data against drive, server, and rack failures. However, if a disaster such as fire or flooding occurs within the data center, all replicas of a storage account using LRS might be lost or unrecoverable, and in the case of a temporary event such as a thermal event occurs within the data center, all replicas may be temporarily available until the event is resolved. To mitigate these risks, Microsoft recommends using [zone-redundant storage](#zone-redundant-storage) (ZRS), [geo-redundant storage](#geo-redundant-storage) (GRS), or [geo-zone-redundant storage](#geo-zone-redundant-storage) (GZRS).
 
 A write request to a storage account that is using LRS happens synchronously. The write operation returns successfully only after the data is written to all three replicas.