Redis Cache - added Service SAS URL steps to Export

Author: steved0x

src/ResourceManager/RedisCache/Commands.RedisCache/help/Export-AzureRmRedisCache.md

@@ -32,7 +32,13 @@ This command exports data from an Azure Redis Cache instance into the container
 ## PARAMETERS
 
 ### -Container
-Specifies the SAS URL of container where this cmdlet exports data.
+Specifies the Service SAS URL of container where this cmdlet exports data. You can generate a Service SAS URL using the following PowerShell commands:
+
+```
+$storageAccountContext = New-AzureStorageContext -StorageAccountName “storageName” -StorageAccountKey “key”
+
+$sasKeyForContainer = New-AzureStorageContainerSASToken -Name “containername” -Permission "rwdl" -StartTime ([System.DateTime]::Now).AddMinutes(-15) -ExpiryTime ([System.DateTime]::Now).AddHours(3) -Context $storageAccountContext -FullUri 
+```
 
 ```yaml
 Type: String