remove the overflow from example container, currently it breaks the dropdown

[jonnysp]

bootstrap/assets/scss/_component-examples.scss

Line 121 in eaaad95

overflow: auto;

[patrickhlauke]

@mdo can't test at the moment, but i'm guessing this then reintroduces the problem noted in #24878 (comment) ? [edit: ah, i see from https://github.com//pull/25054 that you circumvented the problems? i guess until we have a good responsive approach for the culprits, that'll have to do)