[ADD] Inventory: How to change the packaging type for your sale order?

https://docs.google.com/document/d/1HoAg2VOtAPH8M20kwfSGV8xBbikjFoIFtPx9thNqA3c/edit

inventory/management/delivery.rst

@@ -11,4 +11,5 @@ Delivery Orders
    delivery/two_steps
    delivery/three_steps
    delivery/scheduled_dates
-   delivery/dropshipping
+   delivery/dropshipping
+   delivery/label_type

inventory/management/delivery/label_type.rst

@@ -0,0 +1,53 @@
+================================
+How can I change the label type?
+================================
+
+Overview
+========
+
+With Odoo, you can choose among different types of labels for your
+delivery orders. Follow the steps below and give an appropriate label
+type to your delivery.
+
+Configuration
+=============
+
+In the **Inventory** module, Go to **Configuration** and click on
+**Delivery methods**.
+
+Choose a delivery method and then click on **Edit**.
+
+.. image:: media/label_type01.png
+    :align: center
+
+In the **Pricing** tab, under **Fedex label stock type**, you can choose
+one of the label types available. The availability will vary depending
+on the carrier.
+
+.. image:: media/label_type02.png
+    :align: center
+
+Once this is done, you can see the result if you go to the Sales module
+and you create a new sale order.
+
+As you confirm the sale and validate the delivery with the carrier for
+which you have modified the label type, The label will appear in your
+history.
+
+.. image:: media/label_type03.png
+    :align: center
+
+.. image:: media/label_type04.png
+    :align: center
+
+.. image:: media/label_type05.png
+    :align: center
+
+The default label type is paper letter, and if you choose the label type
+bottom half for example, here is the difference :
+
+.. image:: media/label_type06.png
+    :align: center
+
+.. image:: media/label_type07.png
+    :align: center