[ADD] inventory: How to change the label type of your delivery order?

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

inventory/management/delivery.rst

@@ -13,4 +13,5 @@ Delivery Orders
    delivery/scheduled_dates
    delivery/dropshipping
    delivery/label_type
+   delivery/packaging_type
    delivery/delivery_countries

inventory/management/delivery/packaging_type.rst

@@ -0,0 +1,54 @@
+==========================================================
+How can you change the packaging type for your sale order?
+==========================================================
+
+Overview
+========
+
+Odoo gives you the possibility to change the default packaging type and
+adapt the packaging the way you want it, depending on the weight of the
+order.
+
+Configuration
+=============
+
+In the **Inventory** module, Go to **Configuration** and then click on
+**Settings**.
+
+In :menuselection:`Traceability --> Packages`, flag **Record packages used on
+packing : pallets, boxes,...**
+
+.. image:: media/packaging_type01.png
+    :align: center
+
+*Sale process*
+
+In the **Sales** module, go to **Sales** and click on **Sale Order**.
+
+Create your new Sale Order, and **Confirm the Sale**.
+
+.. image:: media/packaging_type02.png
+    :align: center
+
+Once you've confirmed the Sale, you need to click on **Delivery**, to be
+redirected to the Delivery order.
+
+Click on **Edit**, and you can now change the packaging.
+
+.. image:: media/packaging_type03.png
+    :align: center
+
+In the **Operations** tab, in the last column, change the **0** and put
+the number of products that you want to pack together. Then click on
+**Put in Pack**.
+
+.. image:: media/packaging_type04.png
+    :align: center
+
+Choose the type of packaging that you want. You can also see that the
+weight has been adapted to your package, and you can change it manually
+if you want it to be more precise. Then click on **Save**.
+
+Repeat the operation until all the products are put in pack.
+
+Finally, click on **Validate** to confirm the delivery.