Merged
requested to merge github/fork/sophiegit/Update-bootstrap-scss-mixins-_breakpoints into v4-dev
Created by: sophiegit
grid-breakpoint for sm is 576px https://github.com/twbs/bootstrap/blob/v4-dev/scss/_variables.scss#L186-L192
1._breakpoints.scss https://github.com/twbs/bootstrap/blob/v4-dev/scss/mixins/_breakpoints.scss comment says that grid-breakpoint for sm is 544px, but it should be 576px
2.http://v4-alpha.getbootstrap.com/layout/overview/#responsive-breakpoints website document says that grid-breakpoint for sm is 544px, but it should be 576px