Odoo-Build/snippets/stock.report_delivery_document.replace_name.xml

<?xml version="1.0"?>
<data inherit_id="stock.report_delivery_document" priority="50">
    <xpath expr="//span[@t-field='o.name']/.." position="replace">
        <h2>
            Delivery slip <span t-field="o.name"/>
        </h2>
    </xpath>
</data>