DOC: fixed sgml markup

Author: Liudmila Mantrova

doc/src/sgml/multimaster.sgml

@@ -1169,7 +1169,6 @@ pg_ctl -D <replaceable>datadir</replaceable> -l <replaceable>pg.log</replaceable
       in the whole cluster is bigger than the provided value, it can lead to undetected deadlocks.
       </para>
       </important>
-      </para>
       <para>Default: 100
       </para>
     </listitem>