Adding null return for readStringUntil or equivalent for readBytesUntil #901
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The documentation doesn't talk about what is returned when readStringUntil can't find the terminator, so I added it.
I added clarification that if read*Until don't find ther terminator all read characters are discarded.
Also I documented that if a terminator is found (but without previous data) the code manage it has if there is no terminator. (About that, I created arduino/ArduinoCore-avr#491. We should be able to know about the difference)