[IMP] doc: add some documentation of the attributes operation
[IMP] doc: add some documentation of the attributes operation

closes odoo/odoo#20818

Signed-off-by: Xavier Morel (xmo) <0f311f41b2be8e2b5de98776566d712cdc154ca4@odoo.com>
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo