Update azure-files-dynamic-pv.md

Updates related to  User Story 1700819 https://mseng.visualstudio.com/TechnicalContent/_workitems/edit/1700819

Author: john-par

articles/aks/azure-files-dynamic-pv.md

@@ -27,7 +27,7 @@ A storage class is used to define how an Azure file share is created. A storage
 
 * *Standard_LRS* - standard locally redundant storage (LRS)
 * *Standard_GRS* - standard geo-redundant storage (GRS)
-* *Standard_ZRS* - standard zone redundant storage (GRS)
+* *Standard_ZRS* - standard zone redundant storage (ZRS)
 * *Standard_RAGRS* - standard read-access geo-redundant storage (RA-GRS)
 * *Premium_LRS* - premium locally redundant storage (LRS)
 * *Premium_ZRS* - premium zone redundant storage (GRS)