manufacture/mrp_production_note/views/mrp_production_view.xml

<?xml version="1.0" encoding="UTF-8" ?>
<odoo>
    <record id="mrp_production_view_notes_form" model="ir.ui.view">
        <field name="name">mrp.production.notes.form</field>
        <field name="model">mrp.production</field>
        <field name="inherit_id" ref="mrp.mrp_production_form_view" />
        <field name="arch" type="xml">
            <notebook>
                <page string="Notes">
                    <field name="notes" nolabel="1" />
                </page>
            </notebook>
        </field>
    </record>
</odoo>