typo, extra "of the" in description of Processing Sound's Waveform

[montoyamoraga]

Issue description

there is a typo in the description, it says:
"It returns the waveform of the of an audio stream"...

URL(s) of affected page(s)

https://processing.org/reference/libraries/sound/Waveform.html

Proposed fix

it should say:
"It returns the waveform of an audio stream "