[IMP]Improve a tooltip.

addons/account/product.py

addons/hr_expense/hr_expense.py

addons/membership/membership.py

addons/point_of_sale/point_of_sale.py

addons/procurement/procurement.py

addons/product/pricelist.py

addons/product/product.py

addons/product/product_view.xml

addons/purchase/purchase.py

addons/stock/product.py