doc/output: Highlight ethertype value change

Issue: 7855

Highlight the change to how ether_type values are displayed. Previously,
they were displayed in network order as a decimal value.

They are now displayed in host order as a decimal value.

Author: jlucovsky

doc/userguide/upgrade.rst

@@ -43,6 +43,10 @@ Logging Changes
   duplicate attribute types. See :ref:`IKE logging changes
   <9.0-ike-logging-changes>`
 
+- Ethertype values (``ether.ether_type``) are now logged matching the network order value.
+  E.g., previously, ``ether_type`` values were logged in host order;  an ethertype value of ``0xfbb7``
+  (network order) was logged as `47099`` (``0xb7fb``). This ethertype value will be logged as ``64439``.
+
 Upgrading to 8.0.1
 ------------------