Added PerlDoc header

plugins/router/snmp__mikrotik_flash

@@ -1,28 +1,41 @@
 #!/usr/bin/perl -w
-#
-# Copyright (C) 2019 Alejandro Suarez (teconecta.es)
-#
-# Munin plugin to monitor Mikrotik routers Falsh disk utilization.
-# Based on snmp__if_  plugin.
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; version 2 dated June,
-# 1991.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
+=head1 NAME
+
+snmp__mikrotik_flash - Munin plugin to monitor Mikrotik routers Falsh disk utilization.
+
+=head1 APPLICABLE SYSTEMS
+
+Mikrotik Routers
+
+=head1 CONFIGURATION
+
+As a rule SNMP plugins need site specific configuration.  The default
+configuration (shown here) will only work on insecure sites/devices.
+   [snmp_*]
+        env.version 2
+        env.community public
+
+=head1 MAGIC MARKERS
 
 #%# family=snmpauto
 #%# capabilities=snmpconf
 
+=head1 BUGS
+
+None known.
+
+=head1 AUTHOR
+
+Copyright (C) 2020 Alejandro Suarez (teconecta.es)
+Based on snmp__if_  plugin.
+
+=head1 LICENSE
+
+GPLv2.
+
+=cut
+
 use strict;
 use Net::SNMP;