Attempt to un-break the documentation build again

Another case of <xref linkend> in the documentation that
builds INSTALL, which is not allowed.

diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index f1386b7b5d4c8b5f135a163e6a988d3a37b977c9..70f930c57dab882a8eafda4a232f8ca7bf8a204f 100644 (file)
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -1467,8 +1467,10 @@ PostgreSQL, contrib and HTML documentation successfully made. Ready to install.
 
    <note>
     <para>
-     If you are upgrading an existing system be sure to read <xref
-     linkend="upgrading"> which has instructions about upgrading a
+     If you are upgrading an existing system be sure to read
+     <![%standalone-include[the documentation,]]>
+     <![%standalone-ignore[<xref linkend="upgrading">]]>
+     which has instructions about upgrading a
      cluster.
     </para>
    </note>