Update cheatsheets

tldr/linux/speaker-test

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# speaker-test
+
+> Speaker test tone generator for ALSA.
+> See also: `aplay`, `arecord`, `amixer`.
+> More information: <https://manned.org/speaker-test>.
+
+- Test the default speakers with pink noise:
+
+`speaker-test`
+
+- Test the default speakers with a sine wave:
+
+`speaker-test {{-t|--test}} sine {{-f|--frequency}} {{frequency}}`
+
+- Test the default speakers with a predefined WAV file:
+
+`speaker-test {{-t|--test}} wav`
+
+- Test the default speakers with a WAV file:
+
+`speaker-test {{-t|--test}} wav {{-w|--wavfile}} {{path/to/file}}`