Fix wording in 'hidden on...' to be in line with 3.0 wording.
fixes #8714: correct stacked pills nav
Merge pull request #8712 from claydiffrient/3.0.0-wip

Fix wording in 'hidden on...' to be in line with 3.0 wording.
Merge branch '3.0.0-wip' of github.com:twbs/bootstrap into 3.0.0-wip