Update cheatsheets

tldr/linux/systemctl-edit

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemctl edit
+
+> Edit systemd unit files.
+> More information: <https://www.freedesktop.org/software/systemd/man/latest/systemctl.html#edit%20UNIT%E2%80%A6>.
+
+- Replace a unit file non-destructively:
+
+`sudo systemctl edit {{unit_file}}`
+
+- Edit an unit file:
+
+`sudo systemctl edit {{[-l|--full]}} {{unit_file}}`
+
+- Create a new unit file:
+
+`sudo systemctl edit {{[-lf|--full --force]}} {{unit_file}}`