Update cheatsheets

linux/dunstctl

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# dunstctl
+
+> Control command for `dunst`.
+> More information: <https://manned.org/dunstctl>.
+
+- Pause notifications:
+
+`dunstctl set-paused true`
+
+- Un-pause notifications:
+
+`dunstctl set-paused false`
+
+- Close all notifications:
+
+`dunstctl close-all`
+
+- Display help:
+
+`dunstctl --help`