removed links to pgproupgrade from updated pgpro9_6 release notes

Author: Liudmila Mantrova

doc/src/sgml/release-pro-9.6.sgml

@@ -74,7 +74,7 @@
       <productname>Postgres Pro</productname> 9.6.6.1, it is enough to install the new
       version into your current installation directory.
       When upgrading from  <productname>Postgres Pro</productname> 9.6.4.1 or
-      lower, you must also use the <xref linkend="pgproupgrade"> script provided
+      lower, you must also use the <filename>pgpro_upgrade</filename> script provided
       in this distribution. This script updates metadata information to
       handle catalog number format change introduced after 
       <productname>Postgres Pro</productname> 9.6.4.1. If you are upgrading your
@@ -88,7 +88,7 @@
       you must stop postgres service.
       The script must be run on behalf of the user owning the database
       (typically postgres). Running <literal>pgpro_upgrade</literal>
-      as root will result in an error. For details, see <xref linkend="pgproupgrade">.
+      as root will result in an error.
         </para>
       </important>
       <para>If you have compiled <productname>Postgres Pro</productname>