fix(modbus): Fix the mode setup in modbus slave

#14878

Author: alisitsyn

examples/protocols/modbus/serial/mb_slave/main/slave.c

@@ -99,7 +99,7 @@ void app_main(void)
 
     ESP_ERROR_CHECK(mbc_slave_init(MB_PORT_SERIAL_SLAVE, &mbc_slave_handler)); // Initialization of Modbus controller
 
-    // Setup communication parameters and start stack
+    // Setup communication mode and start stack
 #if CONFIG_MB_COMM_MODE_ASCII
     comm_info.mode = MB_MODE_ASCII;
 #elif CONFIG_MB_COMM_MODE_RTU