Andrew Overton 1ec910c31f [Banner] Replace banners docs
Closes https://github.com/material-components/material-components-ios/pull/10104

COPYBARA_INTEGRATE_REVIEW=https://github.com/material-components/material-components-ios/pull/10104 from andrewoverton:material-io-banners-docs 2e14efa457550d8b9d5a8cec3aafab99c1a01b79
PiperOrigin-RevId: 339520045
2020-10-28 12:59:48 -07:00
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2020-10-28 12:59:48 -07:00