refactor odoo company type handling

docs/modules/ROOT/pages/web-portal-billingentity.adoc

@@ -17,9 +17,9 @@ Search is done this way:
 
 When choosing to add a new billing address, two new records are created in the Odoo `res.partner` model:
 
-* A record with the field `company_type = company`
+* A record with the field `is_company = False`
 * A record with the following field configuration:
-** `company_type = person`
+** `is_company = False`
 ** `type = invoice`
 ** `parent_id = company_id`