Update cheatsheets

tldr/linux/systemctl-restart

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemctl restart
+
+> Stop and then start one or more systemd units.
+> Can be used in place of `systemctl start` on a stopped unit, but `start` is safer so that a running unit isn't accidentally restarted.
+> More information: <https://www.freedesktop.org/software/systemd/man/latest/systemctl.html#restart%20PATTERN%E2%80%A6>.
+
+- Restart a unit:
+
+`systemctl restart {{unit}}`
+
+- Restart more than one unit:
+
+`systemctl restart {{unit1 unit2 ...}}`