systemctl-suspend: add page (#18002)

* systemctl-suspend: add page

* fix: Removed a faulty example

Author: TheRootDaemon

pages/linux/systemctl-suspend.md

@@ -0,0 +1,16 @@
+# systemctl suspend
+
+> Suspend the system.
+> More information: <https://www.freedesktop.org/software/systemd/man/latest/systemctl.html#suspend>.
+
+- Suspend the system immediately:
+
+`systemctl suspend`
+
+- Schedule a suspend after a 5 minute delay:
+
+`sleep 300 && systemctl suspend`
+
+- Suspend the system and then hibernate after a delay:
+
+`systemctl hybrid-sleep`