Add warning message (#21935)

Author: yifanz7

src/Storage/Storage.Management/ChangeLog.md

@@ -18,6 +18,8 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* Add a warning message for an upcoming breaking change when creating a storage account 
+    - `New-AzStorageAccount`
 
 ## Version 5.7.0
 * Fixed issue of getting a single blob with leading slashes

src/Storage/Storage.Management/StorageAccount/NewAzureStorageAccount.cs

@@ -26,10 +26,11 @@
 
 namespace Microsoft.Azure.Commands.Management.Storage
 {
-    [GenericBreakingChange("Default value of AllowBlobPublicAccess will be changed from True to False in a future release. " +
-        "When AllowBlobPublicAccess is False on a storage account, it is not permitted to configure container ACLs to allow anonymous access to blobs within the storage account.", 
-        OldWay = "AllowBlobPublicAccess is set to True by defult.", 
-        NewWay = "AllowBlobPublicAccess is set to False by default.")]
+    [GenericBreakingChange("Default value of AllowBlobPublicAccess and AllowCrossTenantReplication will be changed from True to False in a future release. \n" +
+        "When AllowBlobPublicAccess is False on a storage account, it is not permitted to configure container ACLs to allow anonymous access to blobs within the storage account. \n" +
+        "When AllowCrossTenantReplication is False on a storage account, cross AAD tenant object replication is not allowed.",
+        OldWay = "AllowBlobPublicAccess and AllowCrossTenantReplication are set to True by defult.", 
+        NewWay = "AllowBlobPublicAccess and AllowCrossTenantReplication are set to False by default.")]
     [Cmdlet("New", ResourceManager.Common.AzureRMConstants.AzureRMPrefix + "StorageAccount", DefaultParameterSetName = AzureActiveDirectoryDomainServicesForFileParameterSet), OutputType(typeof(PSStorageAccount))]
     public class NewAzureStorageAccountCommand : StorageAccountBaseCmdlet
     {