minor doc updates (#225) #98

Job	Run time
build (adafruit_feather_rp2040) / build	1m 7s
build (adafruit_itsybitsy_rp2040) / build	1m 2s
build (adafruit_qtpy_rp2040) / build	1m 16s
build (arduino_nano_rp2040_connect) / build	1m 17s
build (pico) / build	1m 0s
build (pimoroni_pga2040) / build	58s
build (pimoroni_picolipo_16mb) / build	1m 0s
build (pimoroni_picolipo_4mb) / build	1m 0s
build (pimoroni_tiny2040) / build	1m 3s
build (sparkfun_micromod) / build	1m 12s
build (sparkfun_promicro) / build	57s
build (sparkfun_thingplus) / build	1m 24s
	13m 16s

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