Settings pages across several Odoo apps now use a question mark icon for documentation links instead of a book icon. The updated color and size make these help links more consistent with the rest of the interface and easier to recognize.

Purpose
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- Change the font-awesome icon from fa-book to fa-question.
- Change the icon color to text-secondary (the same than the multi-company
  icon).
- Adjust the icon size to the uppercase text size.

TaskID: 2209062

The helpdesk-related test suite was updated to match a change where products now invoice based on delivery by default instead of sales order. This keeps automated checks aligned with the current business workflow and helps prevent false test failures.

The default invoice policy is now 'delivery'.
Tests assuming the previous default value 'order'
need to be adapted.

Related odoo/odoo#47526
Task 2159161