Reproduce:
1. Open "Sales" app.
2. Open the fist step about company data
3. Hit "Save"
4. The step should have been marked as complete
onboarding: Since the relational model refactoring,
saving a record that is not changed will not result in
calling the onRecordSaved callback, while saved will be `true`
in `saveButtonClicked`.
web: Be more explicit about this fact in the onRecordSaved doc.
Task-3516270
closesodoo/odoo#136143
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>