Bug: Inline checkbox and radio form_items have no right margin

[xak]

See https://sap.github.io/fundamental/form.html#radio-buttons

The tn-form__items must be wrapped with a tn-form-group. It's the same pattern as a form-item where the tn-form__set, tn-form__legend, and tn-form__group act like the item, label and control, respectively.

<fieldset class="tn-form__set">
    <legend class="tn-form__legend">Form set legend</legend>
    <div class="tn-form__group">
        <div class="tn-form__item tn-form__item--inline tn-form__item--check">
            <label class="tn-form__label" for="wmGlO599">
                <input type="radio" class="tn-form__control" id="wmGlO599" name="bar">
            Field label
            </label>
        </div>
        <div class="tn-form__item tn-form__item--inline tn-form__item--check">
            <label class="tn-form__label" for="BucGD706">
                <input type="radio" class="tn-form__control" id="BucGD706" name="bar">
                Field label
            </label>
        </div>
        <div class="tn-form__item tn-form__item--inline tn-form__item--check">
            <label class="tn-form__label" for="2Pvy5435">
                <input type="radio" class="tn-form__control" id="2Pvy5435" name="bar">
                Field label
            </label>
        </div>
    </div>
</fieldset>

[xak]

@saadmhybris I moved this to the site dev board. The markup was never changed on the website to match the test page. This needs to be fixed.