Update cheatsheets

tldr/linux/systemctl-unset-environment

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemctl unset-environment
+
+> Unset one or more service manager environment variables.
+> This undoes the effect of `systemctl set-environment`.
+> More information: <https://www.freedesktop.org/software/systemd/man/latest/systemctl.html#unset-environment%20VARIABLE%E2%80%A6>.
+
+- Unset a single environment variable:
+
+`systemctl unset-environment {{var}}`
+
+- Unset multiple environment variables at once:
+
+`systemctl unset-environment {{var1 var2 ...}}`
+
+- Unset an environment variable in the user service manager:
+
+`systemctl --user unset-environment {{var}}`