[IMP] report: increase bottom margin of A4/US Letter paperformat

addons/report/data/report_paperformat_data.xml

 <?xml version="1.0" encoding="utf-8"?>
 <odoo>
+
         <record id="paperformat_euro" model="report.paperformat">
             <field name="name">European A4</field>
             <field name="default" eval="True" />
@@ -8,7 +9,7 @@
             <field name="page_width">0</field>
             <field name="orientation">Portrait</field>
             <field name="margin_top">40</field>
-            <field name="margin_bottom">23</field>
+            <field name="margin_bottom">28</field>
             <field name="margin_left">7</field>
             <field name="margin_right">7</field>
             <field name="header_line" eval="False" />
@@ -24,7 +25,7 @@
             <field name="page_width">0</field>
             <field name="orientation">Portrait</field>
             <field name="margin_top">40</field>
-            <field name="margin_bottom">20</field>
+            <field name="margin_bottom">25</field>
             <field name="margin_left">7</field>
             <field name="margin_right">7</field>
             <field name="header_line" eval="False" />