update board2.ino document format
update board2.ino document format

songhagwon/entry-hw,entrylabs/entry-hw,entrylabs/entry-hw,kjsii123/entry-hw,entrylabs/entry-hw,songhagwon/entry-hw,kjsii123/entry-hw,kjsii123/entry-hw,songhagwon/entry-hw,songhagwon/entry-hw,kjsii123/entry-hw,entrylabs/entry-hw,entrylabs/entry-hw,entrylabs/entry-hw,songhagwon/entry-hw