[FIX] iot: add protocol setting to Toledo scale

Refactor steps of the Mettler-Toledo scale configuration instructions to
make them clearer.

Add the 3.6 step to the instructions since it is responsible to
configure the protocol used and therefore required to be set to the
value 3 (8217 Mettler-Toledo (WO)) following
[the manual](https://www.mt.com/dam/RET_DOCS/Ariv.pdf) chapter. 2-7.

opw-4519510

closes #12227

X-original-commit: 89037ed
Signed-off-by: Julien Launois (jula) <[email protected]>

Author: Dj0ulo

content/applications/general/iot/devices/scale.rst

@@ -60,10 +60,12 @@ Guide for Ariva S series scales <https://www.mt.com/dam/RET_DOCS/Ariv.pdf>`_ and
 
 #. Hold the **>T<** button for eight seconds, or until :guilabel:`CONF` appears.
 #. Press **>T<** until :guilabel:`GRP 3` appears, then press **>0<** to confirm.
-#. Under :guilabel:`3.1`, ensure the setting is set to :guilabel:`1` (USB Virtual COM ports) and
-   press **>T<** to cycle through the options under group 3.1.
-#. Once :guilabel:`3.1` is set to :guilabel:`1`, press **>0<** to confirm the selection.
-#. Continue to press **>0<** until :guilabel:`GRP 4` appears.
+#. At step :guilabel:`3.1`, make sure the value is set to :guilabel:`1` (USB Virtual COM ports) by
+   pressing **>T<** to cycle through the options.
+#. Press **>0<** until :guilabel:`3.6` (if available, otherwise skip the next step).
+#. At step :guilabel:`3.6`, make sure the value is set to :guilabel:`3` (8217 Mettler-Toledo (WO))
+   by pressing **>T<** to cycle through the options.
+#. Press **>0<** (multiple times if necessary) until :guilabel:`GRP 4` appears.
 #. Press **>T<** until :guilabel:`EXIT` appears.
 
    .. important::