[FIX] l10n_co: change name of RUT document type to NIT

The RUT is the Registro Único Tributario;
the NIT is the Número de Identificación Tributaria.

The number that is used is thus the NIT.

opw 2082599

closes odoo/odoo#38501

Signed-off-by: Nans Lefebvre (len) <len@odoo.com>

addons/l10n_co/models/res_partner.py

@@ -6,7 +6,7 @@ from odoo import api, fields, models
 class ResPartner(models.Model):
     _inherit = 'res.partner'
 
-    l10n_co_document_type = fields.Selection([('rut', 'RUT'),
+    l10n_co_document_type = fields.Selection([('rut', 'NIT'),
                                               ('id_document', 'Cédula'),
                                               ('id_card', 'Tarjeta de Identidad'),
                                               ('passport', 'Pasaporte'),