[FIX] *: RST cleanup

RST cleanup to comply with the RST guidelines. This is required so we
can use "make test", as there are currently hundreds of errors. For now,
it is unusable because of the oldest code in this repo.

closes odoo/documentation#3581

Signed-off-by: Castillo Jonathan (jcs) <jcs@odoo.com>

content/applications/productivity/iot/config/pos.rst

@@ -3,10 +3,10 @@ Use the IoT Box for the PoS
 ===========================
 
 .. image:: pos/pos01.png
-    :align: center
+   :align: center
 
 Prerequisites
-~~~~~~~~~~~~~
+=============
 
 Before starting, make sure you have the following:
 
@@ -27,7 +27,7 @@ Before starting, make sure you have the following:
    page <https://www.odoo.com/page/point-of-sale-hardware>`__
 
 Set Up
-~~~~~~~
+======
 
 To connect hardware to the PoS, the first step is to connect an IoT Box
 to your database. For this, follow this
@@ -62,6 +62,6 @@ and select the devices you want to use in this Point of Sale. Save the
 changes.
 
 .. image:: pos/pos02.png
-    :align: center
+   :align: center
 
 Set up is done, you can launch a new PoS Session.