[IMP] product: minimal quantity
[IMP] product: minimal quantity

User might be confused by the help: they think the vendor cannot sell
the product below this quantity, which is not what the field depicts.

Improve the label and the help of the `min_qty` field to avoid
confusion.

opw-1943511

closes odoo/odoo#31414
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo