rework docs copy: inputs-without-labels are likely the more common case

BS3 commits: 08f470ea689fd65386a10400519ba7c7ff25c411
Update dependencies.

BS3 commits: d4a4bbb729008bc1963ceee50c930ae21cc7d254
add role="alert" to Alert examples, to improve accessibility

BS3 commits: b136d42ba5b9f5e181954bb3ff719552b7d2e228