Update cheatsheets

tldr/linux/systemctl-suspend

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# 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`