Added Serial4 (USART2) and updated compiler#133

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vChavezB wants to merge 14 commits intoarduino:masterfrom

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Commits on Dec 23, 2021

Added enhanced name
Victor
committed
added first support for Serial 4 (i.e., USART2)
Victor
committed
Update UARTClass.cpp
vChavezB
authored
Fixed peripheral mistake
Victor
committed
Update README.md
vChavezB
authored