Remove broken link to Customizing Bootstrap
fix typo in css - buttons
Merge pull request #13901 from knownasilya/typo

Fix typo in css - buttons docs
Fixes #13903: Restore side padding on .btn-block
Merge branch 'master' of github.com:twbs/bootstrap
grid class inconsistency /cc @juthilo
Merge pull request #13900 from twbs/customize_on_your_own

Remove broken link