Clarify

examples/nrf52840/src/bin/pwm_sequence_ws2812b.rs

@@ -20,10 +20,10 @@ use {defmt_rtt as _, panic_probe as _};
 // If you're using the nRF52840-DK, the default "Vdd" power source
 // will set the GPIO I/O voltage to 3.0v, using the onboard regulator.
 // This can sometimes not be enough to drive the WS2812B signal if you
-// are not using an external regulator. If you set the board to "USB" power
-// instead (and provide power via the "nRF USB" connector), the board will
-// instead power the I/Os at 3.3v, which is often enough (but still out of
-// official spec) for the WS2812Bs to work properly.
+// are not using an external level shifter. If you set the board to "USB"
+// power instead (and provide power via the "nRF USB" connector), the board
+// will instead power the I/Os at 3.3v, which is often enough (but still
+// out of official spec) for the WS2812Bs to work properly.
 
 // In the following declarations, setting the high bit tells the PWM
 // to reverse polarity, which is what the WS2812B expects.