Update cheatsheets

tldr/linux/mux

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# mux
+
+> Intercept and multiplex streams of input events.
+> More information: <https://gitlab.com/interception/linux/tools/-/tree/master?ref_type=heads#mux>.
+
+- Create a new muxer with a specified name:
+
+`mux -c {{muxer_name1 muxer_name2 ...}}`
+
+- Set the muxer's internal queue size (default is 100):
+
+`mux -s {{size}}`
+
+- Read input from a named muxer (can be repeated in "switch mode"):
+
+`mux -i {{input_muxer_name}}`
+
+- Write output to a named muxer (can be repeated):
+
+`mux -o {{output_muxer_name}}`