update help

docs/20_Checks/check_snmp_data.md

@@ -4,22 +4,23 @@
 
 **check_snmp_data** is a plugin for fetching performance data with a set of given OIDs.
 
-It can handle current values (i.e. load or cpu usage) and counter values (i.e. network io).
+It can handle current values (i.e. load / cpu usage / disc usage) and counter values (i.e. network io).
 
 ## Syntax
 
-``$ check_snmp_data -h HOSTNAME [-C COOMMUNITYSTRING] -v -m METHOD``
-
-### Parameters
-
-Starting the script without parameters shows a help.
+Start the script without parameter to get the help.
 
 ```txt
+______________________________________________________________________
+
+CHECK_SNMP_DATA 
+v0.6
 
-SNMP performance data v1.0
+(c) Institute for Medical Education - University of Bern
+Licence: GNU GPL 3
+______________________________________________________________________
 
-University of Bern * Institute of Medical Education
-GNU GPL 3.0
+SNMP performance data of Synology storages.
 
 USAGE:
     ./check_snmp_data -h hostname [-C communitystring] -m method
@@ -34,6 +35,7 @@ PARAMETERS:
                           load       System load                                       
                           netio      Network IO (experimental)                         
                           synotemp   Synology NAS temperature                          
+                          disc       Disc usage                                        
 
 EXAMPLE:
     ./check_snmp_data -h 192.168.100.12 -v -m cpu