update docs

docs/20_Checks/check_systemdunit.md

@@ -16,7 +16,7 @@ A unit is everything listed by systemctl command - services, timers, targets, ..
 ______________________________________________________________________
 
 CHECK_SYSTEMDUNIT
-v1.6
+v1.7
 
 (c) Institute for Medical Education - University of Bern
 Licence: GNU GPL 3
@@ -139,14 +139,14 @@ Here are a few examples for services with regex:
 
 ### Check a service with multiple instances
 
-Systemd services with multiple instances contain an @ char.
-In the list of the systemctl command the @ char is followed by a number of the instance.
+Systemd services with multiple instances can be detected automatically.
+In the list of the systemctl command the an instance by a number of the instance in the unit name.
 
 #### All instances
 
-To check if all instances are running use ``@*`` at the end of the servicename (like you would do with ``systemctl status myservice@*``).
+To check if all instances are running use ``*`` at the end of the servicename (like you would do with ``systemctl status myservice*``).
 
-The command ``check_systemdunit myservice@*`` will return a status line how many active and existing instanecs were found:
+The command ``check_systemdunit myservice*`` will return a status line how many active and existing instanecs were found:
 
 ```txt
 OK: 4 of 4 myservice@* units are active
@@ -155,6 +155,6 @@ OK: 4 of 4 myservice@* units are active
 
 #### A single instance
 
-To check if all instances are running use ``@[number]`` at the end of the servicename.
+To check if all instances are running use ``myservice[number]`` at the end of the servicename.
 
-The command ``check_systemdunit myservice@2`` checks the 2nd instance. It is handled like single service check.
+The command ``check_systemdunit myservice2`` checks the 2nd instance. It is handled like single service check.