fix typo

firmware/lib/ws2812b.c

@@ -137,7 +137,7 @@ void ws2812b_show(void)
 		return;
 	}
 	/* WS2812B LEDs use 1 bit per 1.25 us communication input.
-	 * that correspnds to a 800 kHz data transfer rate.
+	 * that correspnds to a 800 kbps data transfer rate.
 	 * on a 16 MHz development board 1 clock cycle needs 62.5 ns.
 	 * this means we have exactly 20 clock cycles to send a single bit.
 	 * this timing constraint is hard to respect with pure C.