Error on the page

Hi,
On this page: https://www.w3.org/TR/2016/NOTE-WCAG20-TECHS-20161007/ARIA14 <https://www.w3.org/TR/2016/NOTE-WCAG20-TECHS-20161007/ARIA14> in the 
"Example 2: A phone number with multiple fields" section the Id = "groupLabe1" are mission a double quote. Thank you.
<div role="group" aria-labelledby="groupLabel">
  <span id="groupLabel" >Work Phone</span>
  +<input type="number" aria-label="country code">
  <input type="number" aria-label="area code">
  <input type="number" aria-label="subscriber number">
</div>
 
Paul