postgresql_transactions: use perldoc documentation header

plugins/postgresql/postgresql_transactions

@@ -1,25 +1,39 @@
 #!/bin/sh
-#
-# Plugin to monitor PostgreSQL Commits and Rollbacks in Transactions
-#
-# Author:
-#    Guilherme Augusto da Rocha Silva <gars.dba@gmail.com>
-#
-# Created:
-#    9th of november 2007
-#
-# Usage:
-#    Place in /etc/munin/plugins/ (or link it there using ln -s)
-#
-# Parameters:
-#    config   (required)
-#
-# General info:
-#    Require permission for database access and read (no writes are processed).
-#    Recommended user is PostgreSQL database owner (default: postgres).
-#
-# Log info:
-#
+
+: <<=cut
+
+=head1 NAME
+
+postgresql_transactions - Plugin to monitor PostgreSQL Commits and Rollbacks in Transactions
+
+
+=head1 USAGE
+
+Usage:
+   Place in /etc/munin/plugins/ (or link it there using ln -s)
+
+General info:
+   Requires permission for database read access (no writes are processed).
+   Recommended user is PostgreSQL database owner (default: postgres).
+
+
+=head1 CONFIGURATION
+
+The following configuration directives may be placed below /etc/munin/plugin-conf.d/ (optional):
+
+   [postgresql_transactions]
+   user postgres
+   env.dbuser postgres
+   env.dbhost localhost
+
+
+=head1 AUTHOR
+
+   Guilherme Augusto da Rocha Silva <gars.dba@gmail.com>
+
+   Copyright (C) 2007 Guilherme Augusto da Rocha Silva <gars.dba@gmail.com>
+
+=cut
 
 dbhost=${dbhost:-localhost}
 dbuser=${dbuser:-postgres}