[IMP] doc: add missing doc on kanban groups
[IMP] doc: add missing doc on kanban groups

group_create, group_delete and group_edit were missing

Closes #17218
hip-odoo/odoo,ygol/odoo,ygol/odoo,hip-odoo/odoo,hip-odoo/odoo,ygol/odoo,hip-odoo/odoo,ygol/odoo,hip-odoo/odoo,ygol/odoo,ygol/odoo,ygol/odoo,hip-odoo/odoo