Add missing documentation for function pg_stat_get_wal_senders()

Euler Taveira de Oliveira

Author: mhagander

doc/src/sgml/monitoring.sgml

@@ -1179,6 +1179,15 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re
       </entry>
      </row>
 
+     <row>
+      <entry><literal><function>pg_stat_get_wal_senders()</function></literal></entry>
+      <entry><type>setof record</type></entry>
+      <entry>
+	   One record for each active wal sender. The fields returned are a subset
+	   of those in the <structname>pg_stat_replication</structname> view.
+      </entry>
+     </row>
+
      <row>
       <entry><literal><function>pg_stat_clear_snapshot()</function></literal></entry>
       <entry><type>void</type></entry>