document that modal show()/hide() return before animation finishes
document that modal show()/hide() return before animation finishes

BS3 commits: 4c246c0117ea56cb10b91b635ff415ec20d9c97d

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