overview.html: add missing <p>
overview.html: add missing <p>

BS3 commits: 19222bfe8962c9987aa96d7bdeb0b5f2ce1505ba

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