Update cheatsheets

linux/shutdown

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# shutdown
+
+> Shutdown and reboot the system.
+> More information: <https://manned.org/shutdown.8>.
+
+- Power off ([h]alt) immediately:
+
+`shutdown -h now`
+
+- [r]eboot immediately:
+
+`shutdown -r now`
+
+- [r]eboot in 5 minutes:
+
+`shutdown -r +{{5}} &`
+
+- Shutdown at 1:00 pm (Uses 24[h] clock):
+
+`shutdown -h 13:00`
+
+- [c]ancel a pending shutdown/reboot operation:
+
+`shutdown -c`