update docs for snmp_data

docs/20_Checks/check_snmp_data.md

@@ -26,10 +26,12 @@ Start the script without parameter to get the help.
 ______________________________________________________________________
 
 CHECK_SNMP_DATA
-v0.8
+v1.0
 
 (c) Institute for Medical Education - University of Bern
 Licence: GNU GPL 3
+
+https://os-docs.iml.unibe.ch/icinga-checks/Checks/check_snmp_data.html
 ______________________________________________________________________
 
 SNMP performance data of Synology storages.
@@ -46,8 +48,8 @@ PARAMETERS:
     -f FILE
         read authentication from config file
         default: "/etc/icinga2/snmp.cfg"
-    -m  method         what to show
-                       method is one of ...
+    -m  METHOD
+        what to show; METHOD is one of ...
             about      About... general device infos                     
             cpu        CPU usage                                         
             load       System load                                       
@@ -69,7 +71,6 @@ CONFIG FILE:
 EXAMPLE:
     check_snmp_data -h 192.168.100.12 -v -m cpu
 
-
 ```
 
 ## Examples