Voltage warning should be placed on RC controller page about donkeydocs HOT 3 CLOSED

@fengye - Thanks for raising this issue. You are right, the PWM output of the RC receiver is equal to the input voltage. Our documentation seems to correctly state to run the RC receiver off the 3.3V rail of the RPi - https://docs.donkeycar.com/parts/rc/. Do you think this requires an extra warning on that page?

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I must have skipped that part. However, I assume people from a background of RC community might think the receiver should get its power directly from an ESC unit by default, so here I think it won't hurt to emphasis it and warn the user of the need to strictly connect the receiver to the 3.3V power rail from Pi GPIO, or otherwise expect some hardware failure.

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I have added a warning to the page to highlight the danger. Thanks for pointing this out.

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