button-groups.html: fix grammar: "in on" => "on"

BS3 commits: ff7e8d5054b95951541cbc01ee58cb46b753f597
fix thumbnails docs

BS3 commits: e8100c3b3ced15114db8038a6dac7d9878f2c331
New text align class, .text-nowrap, for preventing text from breaking to new lines. Applies it to the grid docs table.

BS3 commits: dcbe484a09531da4ecc80fd2991a9910fb6a64ed
fixes 13775: tweak grid nesting docs about # of cols, change up example slightly

BS3 commits: 5c6c0a194d61f8fb8ffca94bc5e695a7dda87fd7
docs callout for 13219

BS3 commits: dacaf619d2410e69ad8d3252ea2d0e992e296a84
text transformation added

BS3 commits: 1d97cbed0fc522304feedead906c3f479370fa06
fixes 13356: clarify use of clearfix on parents

BS3 commits: f77d0aa591d455159ae1d9927333227cf1ae0382
Add nested kbd element styles for actual keys or inputs

BS3 commits: ed2da1c3544458aa4f113dbf4864b99f803f404d
grunt. grunt

BS3 commits: 9a51410fd37154e8b25937017bad4912fbf57d99,
57bd8f943b7768589cfa05ca8fcc8ec6cd123770
grunt. grunt. Fixes 13548: Use position: absolute; to fix checkbox and radio line-height problems that were introduced after 13003. New text align class, .text-nowrap, for preventing text from breaking to new lines. Applies it to the grid docs table. grunt. grunt. grunt

BS3 commits: 9a51410fd37154e8b25937017bad4912fbf57d99,
c0e82accadea85094ef2f8b208975c449130f33f,
631e04b6fc1cc643610684fe3d3c683ee486a9fe,
dcbe484a09531da4ecc80fd2991a9910fb6a64ed,
7bcd78847ffe3c85d024f097e7102667e3c79604,
5c1357b3e96bfa87994251ee97bef6e7315b6b83,
f09d6b7a9827452d259b4daafbe3f8341b557776