[TextFields] Correcting documentation (#2844)
[TextFields] Correcting documentation (#2844)

Overriding cancelled travis since this is for a .md file only.
material-components/material-components-ios,sigito/material-components-ios,randallli/material-components-ios,samnm/material-components-ios,samnm/material-components-ios,material-components/material-components-ios,randallli/material-components-ios,randallli/material-components-ios,samnm/material-components-ios,sigito/material-components-ios,material-components/material-components-ios,sigito/material-components-ios,randallli/material-components-ios,material-components/material-components-ios,material-components/material-components-ios,sigito/material-components-ios,randallli/material-components-ios,samnm/material-components-ios,randallli/material-components-ios,sigito/material-components-ios,samnm/material-components-ios