add more information for continuous export command help

Author: frankguodongchen

src/ResourceManager/ApplicationInsights/Commands.ApplicationInsights/help/New-AzureRmApplicationInsightsContinuousExport.md

@@ -40,9 +40,11 @@ Create a new application insights continuous export configuration for an applica
 
 ### Example 1 Create a new continuous export configuration for an application insights resource
 ```
+PS C:\> $sastoken = New-AzureStorageContainerSASToken -Name testcontainer -Context $context -ExpiryTime (Get-Date).AddYears(50) -Permission w
+PS C:\> $sasuri = "https://teststorageaccount.blob.core.windows.net/testcontainer" + $sastoken
 PS C:\> New-AzureRmApplicationInsightsContinuousExport -ResourceGroupName "testgroup" -Name "test"
  -DocumentType "Request","Trace", "Custom Event" -StorageAccountId "/subscriptions/50359d91-7b9d-4823-85af-eb298a61ba96/resourceGroups/testgroup/providers/Microsoft.Storage/storageAccounts/teststorageaccount" -StorageLocation sourcecentralus
- -StorageSASUri "https://teststorageaccount.blob.core.windows.net/testcontainer?sv=2050-04-05&sr=c&sig=xxxxxxxxx"
+ -StorageSASUri $sasuri
 
 ExportId                         : jlTFEiBg1rkDXOCIeJQ2mB2TxZg=
 StorageName                      : teststorageaccount

src/ResourceManager/ApplicationInsights/Commands.ApplicationInsights/help/Set-AzureRmApplicationInsightsContinuousExport.md

@@ -42,9 +42,11 @@ Update a continuous export configuration in an applciation insights resource
 
 ### Example 1
 ```
+PS C:\> $sastoken = New-AzureStorageContainerSASToken -Name testcontainer -Context $context -ExpiryTime (Get-Date).AddYears(50) -Permission w
+PS C:\> $sasuri = "https://teststorageaccount.blob.core.windows.net/testcontainer" + $sastoken
 PS C:\> Set-AzureRmApplicationInsightsContinuousExport -ResourceGroupName "testgroup" -Name "test"
  -DocumentTypes "Request","Trace" -ExportId "jlTFEiBg1rkDXOCIeJQ2mB2TxZg=" -DestinationStorageAccountId "/subscriptions/50359d91-7b9d-4823-85af-eb298a61ba96/resourceGroups/testgroup/providers/Microsoft.Storage/storageAccounts/teststorageaccount" -DestinationStorageLocationId sourcecentralus
- -DestinationStorageSASUri "https://teststorageaccount.blob.core.windows.net/testcontainer?sv=2050-04-05&sr=c&sig=xxxxxxxxx"
+ -DestinationStorageSASUri $sasuri
 
 ExportId                         : jlTFEiBg1rkDXOCIeJQ2mB2TxZg=
 StorageName                      : teststorageaccount