docs(vibrate): modify docs
docs(vibrate): modify docs

xueron/ionic-native,driftyco/ionic-native,ramonornela/ionic-native,klirix/ionic-native,ramonornela/ionic-native,driftyco/ionic-native,driftyco/ionic-native,xueron/ionic-native,xueron/ionic-native,klirix/ionic-native,ramonornela/ionic-native,ramonornela/ionic-native,xueron/ionic-native,klirix/ionic-native