[DOC] base: more explicit documentation

compute_sudo has no effects on non stored computed fields.
It was technically already said in the previous lines (REcomputed) but
it was not particularly explicit

closes odoo/odoo#31320

odoo/fields.py

@@ -157,6 +157,7 @@ class Field(MetaField('DummyField', (object,), {})):
 
         :param compute_sudo: whether the field should be recomputed as superuser
             to bypass access rights (boolean, by default ``False``)
+            Note that this has no effects on non-stored computed fields
 
         The methods given for ``compute``, ``inverse`` and ``search`` are model
         methods. Their signature is shown in the following example::