Update nagios documentation.

Author: liske

README.nagios.md

@@ -5,13 +5,18 @@ Needrestart can be used as a nagios plugin:
 
 ```console
 # needrestart -p
-CRIT - Kernel: 3.16.0-4-amd64, Services: none, Containers: 1 (!), Sessions: none|Kernel=0;0;;0;2 Services=0;;0;0 Containers=1;;0;0 Sessions=0;0;;0
+CRIT - Kernel: 4.6.0-1-amd64, Services: 1 (!), Containers: none, Sessions: 2 (!)|Kernel=0;0;;0;2 Services=1;;0;0 Containers=0;;0;0 Sessions=2;0;;0
+Services:
+- NetworkManager.service
+Sessions:
+- thomas @ session #16
+- thomas @ user manager service
 ```
 
 Since needrestart requires root privileges to scan processes of other
 users you should use sudo. Needrestart ships some example files to run
 needrestart as nagios plugin using sudo:
 
 - `ex/nagios/check_needrestart` - calls sudo to invoke needrestart
-- `ex/nagios/needrestart` - sudo(8) config allowing nagios to run needrestart as root
+- `ex/nagios/needrestart-nagios` - sudo(8) config allowing nagios to run needrestart as root
 - `ex/nagios/plugin.conf` - nagios(8) integration