fix #12298
spacing
Merge branch 'master' of github.com:twbs/bootstrap
Merge pull request #12308 from twbs/fix-12298

Fix #12298
fix typo in README
Update index.html

This is very minor, but to help encourage best practises it'd be best to have the input type 'email' for this email input example instead of 'text'
Merge pull request #12321 from coliff/patch-3

Update index.html