WCAG/1.4.1: Fix example for text cues on a form's required elements

The input element must be wrapped by <label> either or the <label> tag
needs a "for=id" attribute with the id of the respective input.

refs #7934

doc/accessibility/text-cue-for-required-form-control-labels.html

@@ -28,8 +28,8 @@
             Enter some text
             <span class="required-indicator" aria-hidden="true"></span>
             <span class="sr-only"> (required)</span>
+            <input type="text" name="some_text" value="" aria-required="true" required>
         </label>
-        <input type="text" name="some_text" value="" aria-required="true" required>
         <input type="submit" name="btn_submit" value="Submit">
     </form>
 </body>