[Buttons] Minor copy edits to the main readme. (#3589)
[Buttons] Minor copy edits to the main readme. (#3589)


material-components/material-components-ios,randallli/material-components-ios,material-components/material-components-ios,material-components/material-components-ios,randallli/material-components-ios,material-components/material-components-ios,randallli/material-components-ios,randallli/material-components-ios,randallli/material-components-ios,material-components/material-components-ios,randallli/material-components-ios