add docs JS to activate popover demos; fixes 13937

BS3 commits: 0bc2edd191ba38946b79bd92a96d3adcd11d26c8
docs: minor correction to the focus-triggered popover demo explanation

BS3 commits: 2f7d5fd26ba3bfa2bed3bfa5b348a77d66134178
regenerate docs.min.js

BS3 commits: fde088751ab4fe87ea574c53afe1f9cada728a7d