docs: encoder's 'symbols' parameter may be a hw buffer (IDFGH-16932)

[floitsch]

Description

The symbols parameter given to the RMT encoder's callback function may be a hardware buffer which can't be used as target for memcpy.

Related

https://esp32.com/viewtopic.php?t=47324

Testing

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Note

Clarifies in rmt_encoder.h that the symbols buffer in the simple encoder callback may be a hardware buffer and must not be used with memcpy.

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