Apply suggestion to pycardium/modules/sys_leds.c

pycardium/modules/sys_leds.c

@@ -221,7 +221,7 @@ mp_leds_blink_rocket(mp_obj_t led_in, mp_obj_t value_in, mp_obj_t time_in)
 	int time  = mp_obj_get_int(time_in);
 
 	if (value > 31) {
-		mp_raise_ValueError("brightness must by < 32");
+		mp_raise_ValueError("brightness must be < 32");
 	}
 
 	epic_leds_blink_rocket(led, value, time);