reboot: update markdown help

docs/20_Checks/check_reboot_required.md

@@ -20,16 +20,45 @@ From this repository ypu need next to this script:
 
 `$ check_reboot_required [-h]`
 
-### Parameters
+```txt
+______________________________________________________________________
+
+CHECK_REBOOT_REQUIRED
+v1.5
+
+(c) Institute for Medical Education - University of Bern
+Licence: GNU GPL 3
+
+https://os-docs.iml.unibe.ch/icinga-checks/Checks/check_reboot_required.html
+______________________________________________________________________
+
+Check if a reboot is required.
+It works for Centos and Debian/ Ubuntu and Manjaro
+
+If the reboot is required:
+
+* On Centos it shows the kernel number that will be installed,
+* On Debian/ Ubuntu it shows the packages that require the reboot,
+* On Manjaro it shows if a newer kernel or which libs require the reboot.
+  The check for libs uses lsof.
+
+If your distro is based on Arch, Centos or Debian then it easily can be added
+in the script if it does not work. Report the distro name to the author.
+
+SYNTAX:
+check_reboot_required
 
-```text
 OPTIONS:
 
     -h or --help   show this help.
 
 PARAMETERS:
 
-    None
+    None.
+
+EXAMPLE:
+check_reboot_required
+
 ```
 
 ## Examples
@@ -54,5 +83,6 @@ WARNING: [centos] need to reboot for kernel package   kernel is not installed (c
 
 ```txt
 ./check_reboot_required
-UNKNOWN: distro [manjaro] was detected but is not supported (yet).
+UNKNOWN: distro [otherlinux] was detected but is not supported (yet).
+If your distro is based on Arch, Centos or Debian then it easily can be added in the script. Report the distro name to the author.
 ```