Update cheatsheets

tldr/linux/systemctl-freeze

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemctl freeze
+
+> Freeze one or more units.
+> Frozen units can be resumed with `systemctl thaw`.
+> More information: <https://www.freedesktop.org/software/systemd/man/latest/systemctl.html#freeze%20PATTERN%E2%80%A6>.
+
+- Freeze a specific unit:
+
+`systemctl freeze {{unit}}`
+
+- Freeze multiple units:
+
+`systemctl freeze {{unit1 unit2 ...}}`
+
+- Freeze all running units:
+
+`systemctl freeze '*'`