replace .visible-{size} with .visible-{size}-{display} ; fixes #8869
fix grammar in comment in forms.less
Merge branch 'master' into fix-8869
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Replace some images on the Carousel example with some base64 encoded 1x1 gifs
Merge pull request #12204 from twbs/fix-8869

replace .visible-{size} with .visible-{size}-{display}