ArduinoISP: Add an option to enable a 4 MHz clock signal on pin 3#17

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per1234 wants to merge 3 commits intomainfrom

Commits on Sep 26, 2020

Add an option on Uno boards to enable a 4 MHz clock signal on pin 3

pr1csynth
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per1234
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Make ArduinoISP code formatting compliant with examples_formatter.conf
per1234
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Correct misspelled word in ArduinoISP comment
per1234
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