Minor improvement to pg_seclabel documentation.

This is a bit more consistent with the way pg_description is
documented, and also include a useful cross-link.

doc/src/sgml/catalogs.sgml

@@ -4669,8 +4669,9 @@
 
   <para>
    The catalog <structname>pg_seclabel</structname> stores security
-   labels on database objects.  See the
+   labels on database objects.  Security labels can be manipulated
-   <xref linkend="sql-security-label"> statement.
+   with the <xref linkend="sql-security-label"> command.  For an easier
+   way to view security labels, see <xref linkend="view-pg-seclabels">.
   </para>
 
   <table>