Update documentation to match pg_stat_activity changes.

doc/src/sgml/monitoring.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/monitoring.sgml,v 1.79 2010/04/15 20:56:13 petere Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/monitoring.sgml,v 1.80 2010/04/26 19:56:55 tgl Exp $ -->
 
 <chapter id="monitoring">
  <title>Monitoring Database Activity</title>
@@ -235,9 +235,9 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re
       <entry><structname>pg_stat_activity</></entry>
       <entry>One row per server process, showing database OID, database
       name, process <acronym>ID</>, user OID, user name, application name,
-      current query, query's waiting status, time at which the current
-      transaction and current query began execution, time at which the
-      process was started, and client's address and port number.
+      client's address and port number, times at which the server process,
+      current transaction, and current query began execution, process's waiting
+      status, and text of the current query.
       The columns that report data on the current query are available unless
       the parameter <varname>track_activities</varname> has been turned off.
       Furthermore, these columns are only visible if the user examining
@@ -695,7 +695,7 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re
       <entry>
        Returns a record of information about the backend with the specified pid, or
        one record for each active backend in the system if <symbol>NULL</symbol> is
-       specified. The fields returned are the same as in the 
+       specified. The fields returned are a subset of those in the
        <structname>pg_stat_activity</structname> view.
       </entry>
      </row>