Updated doc header in conf file

Author: cavaliercoder

conf/libzbxpgsql.conf

@@ -1,23 +1,25 @@
-# File: /etc/libzbxpgsql.d/query.conf
+# File: /etc/zabbix/libzbxpgsql.conf
 # 
-# This file contains SQL to be executed by `pg_query.*` keys
+# This file contains configuration for all pg.* keys.
 #
-# The default directory for SQL config files is:
-#    /etc/libzbxpgsql.d
-# This default can be changed by setting the PGQUERYPATH environment variable
-# for the agent before startup.
+# By default, this file is loaded from /etc/zabbix/libzbxpgsql.conf, unless
+# the PGCONFIGFILE environment variable is set to a different path.
 #
-# *ALL* files in the config directory that end in ".conf" will be read and
-# parsed.
+# The config file is only read at startup of Zabbix agent. If you modify the
+# config file, you will need to restart the Zabbix agent for it to take effect.
+#
+# Syntax errors in the config file will prevent Zabbix from starting.
 #
 # The config files are parsed by the C libconfig module: 
 #    http://www.hyperrealm.com/main.php?s=libconfig
 #
-# The format of the config file is:
-#    SQLkey = "SQL statement";
-#
 # Comment lines begin with a hash '#'.
 #
+# The format for defining named SQL queries is:
+# queries = {
+#    SQLkey = "SQL statement";
+# };
+#
 # Requirements:
 #  - The SQL key must be alphanumeric and can contain dashes and underscores
 #    (-DO NOT- use asterisks or spaces in the key name).
@@ -27,14 +29,8 @@
 #        "SELECT \"UPPERCASECOLUMN\" from table;";
 #  - A semicolon is required at the end of each config entry.
 #
-# Syntax errors in any config file will cause the Zabbix agent to shut down.
-#
-# Config files are only read at startup of Zabbix agent. If you add, change, or
-# remove config files you will need to restart the Zabbix agent for it to
-# re-read the files.
-#
 # Example Query Setup (with substitution variables):
-#  * SQL key used in Zabbix server:
+#  * Zabbix agent key, including a named query:
 #       pg_query.integer[,,myquery,45,200]
 #
 #  * Matching query from the config file:
@@ -51,9 +47,8 @@
 #    AlsoGood = "select count(*) "
 #               "  from pg_stat_activity;";
 #
-#
-# Test Queries
 
+# Example Queries
 queries = {
 	teststr = "SELECT $1::text || $2::text;";
 	testint = "SELECT $1::int;";