Added needs-restarting's notes to the knowledge base

knowledge base/needs-restarting.md

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+# Needs-restarting
+
+`needs-restarting -r` returns 1 if a reboot is needed, and 0 if it is not.
+
+## TL;DR
+
+```shell
+# Install.
+sudo dnf install dnf-utils
+sudo yum install yum-utils
+
+# Check if a full reboot is required.
+sudo needs-restarting -r
+
+# Show what services need to be restarted.
+sudo needs-restarting -s
+```
+
+```text
+$ sudo needs-restarting
+The following running processes use deleted files:
+
+PID  | PPID | UID  | User       | Command                           | Service
+-----+------+------+------------+-----------------------------------+----------------
+731  | 1    | 488  | avahi      | avahi-daemon                      | avahi-daemon
+736  | 1    | 490  | messagebus | dbus-daemon                       | dbus
+…
+6260 | 1756 | 1000 | mek        | kdeinit5                          | 
+
+You may wish to restart these processes.
+See 'man zypper' for information about the meaning of values in the above table.
+
+Core libraries or services have been updated.
+Reboot is required to ensure that your system benefits from these updates.
+```
+
+## Sources
+
+- [Automatic Reboot on Kernel Update]
+
+[automatic reboot on kernel update]: https://access.redhat.com/discussions/3106621#comment-1196821