Update cheatsheets

tldr/linux/systemctl-link

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemctl link
+
+> Link a unit file located outside the unit file search path into the search path.
+> See also: `systemctl disable`.
+> More information: <https://www.freedesktop.org/software/systemd/man/systemctl.html#link%20PATH%E2%80%A6>.
+
+- Link a unit file to make it available for systemd commands:
+
+`systemctl link {{path/to/service}}`
+
+- Link multiple unit files at once:
+
+`systemctl link {{path/to/service1 path/to/service2 ...}}`