Remove pageprep reference from RN EE 10.4.1

Author: dmpgpro

doc/src/sgml/release-proee-10.sgml

@@ -130,9 +130,6 @@
       in <link linkend="release-proee-10-1-1">Postgres Pro Enterprise 10.1.1 Release Notes</link>.
       If you are opting for a dump/restore, make sure to use the <literal>--add-collprovider</literal>
       option to correctly choose the collation provider for the migrated database.
-      If you are opting for <filename>pg_upgrade</filename> and the original cluster
-      is using 32-bit transaction IDs, you must also run the <filename>pg_pageprep</filename>
-      extension, as explained in <xref linkend="pg-pageprep">.
     </para>
 
   </sect2>