Add another link of a GUC variable to where it is explained.

diff --git a/doc/src/sgml/maintenance.sgml b/doc/src/sgml/maintenance.sgml
index 0261555de2428405f1678a97a32d6674921ac7c2..e9180a07c4eaa8fb40895947ea66f209850e4df1 100644 (file)
--- a/doc/src/sgml/maintenance.sgml
+++ b/doc/src/sgml/maintenance.sgml
@@ -603,7 +603,7 @@ HINT:  Stop the postmaster and use a standalone backend to VACUUM in "mydb".
 
    <para>
     Tables whose <structfield>relfrozenxid</> value is more than
-    <varname>autovacuum_freeze_max_age</> transactions old are always
+    <xref linkend="guc-autovacuum-freeze-max-age"> transactions old are always
     vacuumed (this also applies to those tables whose freeze max age has
     been modified via storage parameters; see below).  Otherwise, if the
     number of tuples obsoleted since the last