azcopy only needs same AAD tenant if both OAuth

Fixes: 032cee4 ("Some updates:")

Author: alxu-avpt

articles/storage/common/storage-use-azcopy-blobs-copy.md

@@ -31,7 +31,7 @@ See the [Get started with AzCopy](storage-use-azcopy-v10.md) article to download
 
 Apply the following guidelines to your AzCopy commands.
 
-- Source and destination accounts must belong to the same Azure AD tenant.
+- If using OAuth authentication for both the source and destination, they must be in the same Azure AD tenant.
 
 - Your client must have network access to both the source and destination storage accounts. To learn how to configure the network settings for each storage account, see [Configure Azure Storage firewalls and virtual networks](storage-network-security.md?toc=/azure/storage/blobs/toc.json).