present browser compatibility info in a table. copy

BS3 commits: 172de467eb1ddf869fac06636e1dd8ae35cfba94,
dcdf716eef06ceed259c525a0ab70e7065e3a14a
Make spelling of Less uniform throughout the docs

BS3 commits: a56cf753ceba9aebb31fdca48fae96ebfc188b1d