doc: fix reference for finding replication slots to drop

Commit a70bce43fb added instructions on how to recover if PostgreSQL
refuses to issue new transaction IDs because of imminent wraparound,
but when describing how to find replication slots that should be dropped,
it referred to pg_stat_replication where it should have referenced
pg_replication_slots.

In passing, decorate references to views with <structname> tags.

Backpatch to all supported versions.

Reported-By: Sanjaya Waruna <sanjaya.waruna@gmail.com>
Author: Laurenz Albe <laurenz.albe@cybertec.at>
Reviewed-by: Robert Treat <rob@xzilla.net>
Reviewed-by: Fujii Masao <masao.fujii@gmail.com>
Discussion: https://postgr.es/m/176767268098.1084085.10345048667224193115@wrigleys.postgresql.org
Backpatch-through: 14

diff --git a/doc/src/sgml/maintenance.sgml b/doc/src/sgml/maintenance.sgml
index aa2df371efb7e0875a5a2bfddc1528fa88ab8691..6964051008040303c29ba475f8e17bc1ac103614 100644 (file)
--- a/doc/src/sgml/maintenance.sgml
+++ b/doc/src/sgml/maintenance.sgml
@@ -681,20 +681,20 @@ HINT:  Stop the postmaster and vacuum that database in single-user mode.
     <orderedlist>
      <listitem>
       <simpara>Resolve old prepared transactions. You can find these by checking
-       <link linkend="view-pg-prepared-xacts">pg_prepared_xacts</link> for rows where
+       <link linkend="view-pg-prepared-xacts"><structname>pg_prepared_xacts</structname></link> for rows where
        <literal>age(transactionid)</literal> is large. Such transactions should be
        committed or rolled back.</simpara>
      </listitem>
      <listitem>
       <simpara>End long-running open transactions. You can find these by checking
-       <link linkend="monitoring-pg-stat-activity-view">pg_stat_activity</link> for rows where
+       <link linkend="monitoring-pg-stat-activity-view"><structname>pg_stat_activity</structname></link> for rows where
        <literal>age(backend_xid)</literal> or <literal>age(backend_xmin)</literal> is
        large. Such transactions should be committed or rolled back, or the session
        can be terminated using <literal>pg_terminate_backend</literal>.</simpara>
      </listitem>
      <listitem>
       <simpara>Drop any old replication slots. Use
-       <link linkend="monitoring-pg-stat-replication-view">pg_stat_replication</link> to
+       <link linkend="view-pg-replication-slots"><structname>pg_replication_slots</structname></link> to
        find slots where <literal>age(xmin)</literal> or <literal>age(catalog_xmin)</literal>
        is large. In many cases, such slots were created for replication to servers that no
        longer exist, or that have been down for a long time. If you drop a slot for a server