Update cheatsheets

tldr/linux/systemctl-isolate

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemctl isolate
+
+> Start the specified unit with its dependencies and stop all others.
+> Ignores the units which have `IgnoreOnIsolate=yes`.
+> More information: <https://www.freedesktop.org/software/systemd/man/systemctl.html#isolate%20UNIT>.
+
+- Switch to a target (assumed `.target` if no extension provided):
+
+`systemctl isolate {{target}}`
+
+- Switch to graphical target explicitly:
+
+`systemctl isolate graphical.target`
+
+- Switch to rescue (single-user) mode:
+
+`systemctl isolate rescue.target`
+
+- Switch to emergency mode:
+
+`systemctl isolate emergency.target`