BZ-2071810 fixed Azure resource group parameter name

Author: bscott-rh

modules/migration-configuring-azure.adoc

@@ -63,7 +63,7 @@ $ AZURE_STORAGE_ACCOUNT_ID="velero$(uuidgen | cut -d '-' -f5 | tr '[A-Z]' '[a-z]
 ----
 $ az storage account create \
     --name $AZURE_STORAGE_ACCOUNT_ID \
-    --resource-group $AZURE_BACKUP_RESOURCE_GROUP \
+    --resource-group $AZURE_RESOURCE_GROUP \
     --sku Standard_GRS \
     --encryption-services blob \
     --https-only true \