Revert "fix styling of alert-dismissable example"

This reverts commit b3a23fa33a261295ed69adc9fbc75b70bf354962.
[doc] minor fix in the LESS mixins example
Merge pull request #10276 from javiereguiluz/patch-3

Correct comment in grid mixin example
fix #10292
Merge remote-tracking branch 'original/master'
Update #10160, improved .make-container