using more concise description

cgminer.c

@@ -1077,7 +1077,7 @@ static struct opt_table opt_config_table[] = {
 		     "Set avalon target temperature"),
 	OPT_WITH_ARG("--bitburner-voltage",
 		     opt_set_intval, NULL, &opt_bitburner_core_voltage,
-		     "Set ASIC core voltage (for BitBurner boards only), in millivolts"),
+		     "Set BitBurner core voltage, in millivolts"),
 #endif
 	OPT_WITHOUT_ARG("--load-balance",
 		     set_loadbalance, &pool_strategy,