Remove pg_pageprep from RN 10.4.1

Author: dmpgpro

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

@@ -14,14 +14,6 @@
     <link linkend="release-10-4"><productname>PostgreSQL</productname> 10.4 Release Notes</link>.
     Other major changes and enhancements are as follows:</para>
     <itemizedlist spacing="compact">
-      <listitem>
-        <para>Added <filename>pg_pageprep</filename> module to facilitate
-          migration from <productname>PostgreSQL</productname>-based
-          products that use 32-bit transaction IDs to
-          <productname>Postgres Pro Enterprise</productname> 10 that uses 64-bit
-          transaction IDs. (See <xref linkend="pg-pageprep">.)</para>
-        <!-- 89b10517a5126d1fdbbe69652f67fc17a28fa2da -->
-      </listitem>
       <listitem>
         <para>Updated the <xref linkend="mchar"> to fix the sorting order for
           Cyrillic letters Yo and short I.