Link to $jsOptions options

[bologer]

Please add some documentation where to get list of settings for JS widget in $jsOptions doc block property for PhoneInput class.

Such as:

/**
 * @link https://github.com/jackocnr/intl-tel-input#options More information about JS-widget options.
 * @var array Options of the JS-widget
 */
public $jsOptions = [];

Thanks in advance.

[Borales]

@bologer Done