[FW][FIX] sales: corrected pricelist configuration detail

[fw-bot]

made a requested change per this PROJECT TASK: https://www.odoo.com/web#id=3859193&cids=3&model=project.task&view_type=form

• added an important admonition to describe the importance of the pricelist order on the pricelist page (lines 52-55)
• added a second sentence of clarification in the note admonition that follows (line 62)

Forward-Port-Of: odoo/documentation#9083

[robodoo]

Pull request status dashboard.

[fw-bot]

This PR targets saas-17.2 and is part of the forward-port chain. Further PRs will be created up to master.

More info at https://github.com/odoo/odoo/wiki/Mergebot#forward-port