Update audio.md to resolve syntax errors #1321
Merged
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What This PR Changes
Resolves syntax errors, seems like potentially a linter or formatter tried to escape asterisks, and in cases of variable assignment, changed them to underscores, breaking the code.
Validated here:
https://wokwi.com/projects/375416657031917569
See also a very similarly updated example here:
https://projecthub.arduino.cc/rowan07/rickroll-piezo-buzzer-b3d9fd
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