add detail to navbar component alignment section
add detail to navbar component alignment section

BS3 commit cd2d7b5

up2vs/todc-bootstrap,2947721120/todc-bootstrap,ztx1491/todc-bootstrap,2947721120/googlebt4,todc/todc-bootstrap,mozillo/todc-bootstrap,todc/todc-bootstrap,aaroncnhk/todc-bootstrap,todc/todc-bootstrap