make spellfix (+ manual tweak)

src/machine/machine_nrf.go

@@ -551,7 +551,7 @@ func handleSoftDeviceEvents() {
 			return // TODO: nrf51 etc
 		}
 		if result != 0 {
-			// Some error occured. The only possible error is
+			// Some error occurred. The only possible error is
 			// NRF_ERROR_NOT_FOUND, which means there are no more events.
 			return
 		}

src/machine/machine_rp2_spi.go

@@ -309,7 +309,7 @@ func (spi *SPI) tx(tx []byte) error {
 
 	// Make sure the read buffer stays alive until this point (in the unlikely
 	// case the tx slice wasn't read after this function returns and a GC cycle
-	// happened inbetween).
+	// happened in the meantime).
 	keepAliveNoEscape(unsafe.Pointer(unsafe.SliceData(tx)))
 
 	// We didn't read any result values, which means the RX FIFO has likely