Update cheatsheets

tldr/linux/pw-mididump

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pw-mididump
+
+> Dump MIDI messages to `stdout`.
+> More information: <https://docs.pipewire.org/page_man_pw-mididump_1.html>.
+
+- Listen for and dump all incoming MIDI events:
+
+`pw-mididump`
+
+- Dump MIDI events from a specific file:
+
+`pw-mididump {{path/to/file.mid}}`
+
+- Connect to a specific remote PipeWire instance:
+
+`pw-mididump {{[-r|--remote]}} {{remote_instance_name}}`
+
+- Display help:
+
+`pw-mididump {{[-h|--help]}}`