Update cheatsheets

tldr/linux/systemctl-soft-reboot

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemctl soft-reboot
+
+> Shut down and reboot userspace, leaving the kernel running.
+> More information: <https://www.freedesktop.org/software/systemd/man/latest/systemctl.html#soft-reboot>.
+
+- Perform a soft reboot immediately:
+
+`systemctl soft-reboot`
+
+- Force a soft reboot:
+
+`systemctl soft-reboot --force`
+
+- Schedule a soft reboot for a specific time:
+
+`systemctl soft-reboot --when "{{timestamp}}"`
+
+- Cancel a scheduled soft reboot:
+
+`systemctl soft-reboot --when cancel`