Update cheatsheets

tldr/linux/systemctl-reenable

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemctl reenable
+
+> Re-enable one or more units.
+> Used when targets of a service change.
+> More information: <https://www.freedesktop.org/software/systemd/man/systemctl.html#reenable%20UNIT%E2%80%A6>.
+
+- Re-enable a unit, restoring its default symlinks:
+
+`systemctl reenable {{unit}}`
+
+- Re-enable multiple units at once:
+
+`systemctl reenable {{unit1 unit2 ...}}`
+
+- Re-enable a unit and start it immediately:
+
+`systemctl reenable {{unit}} --now`