DOC: removed pgpro_upgrade references from 9.5/9.6 RNs

Author: Liudmila Mantrova

doc/src/sgml/release-pro-9.5.sgml

@@ -86,7 +86,7 @@
     <para>If you are running <productname>Postgres Pro</productname> 9.5.9.1,
     it is enough to install the 9.5.10.1 version into the same directory.
     For earlier <productname>Postgres Pro</productname> versions,
-    <xref linkend="pgproupgrade"> script is required to complete the upgrade:
+    <filename>pgpro_upgrade</filename> script is required to complete the upgrade:
     <itemizedlist spacing="compact">
       <listitem>
        <para>
@@ -110,7 +110,7 @@
         you must stop the <literal>postgres</literal> service.
         The script must be run on behalf of the user owning the
         database (typically postgres). Running <filename>pgpro_upgrade</filename>
-        as root will result in an error. For details, see <xref linkend="pgproupgrade">.
+        as root will result in an error. For details, see <filename>pgpro_upgrade</filename>.
       </para>
     </important>
     </para>

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

@@ -120,7 +120,7 @@
       <productname>Postgres Pro</productname> 9.6.5.1, 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
@@ -134,7 +134,7 @@
       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>