Issue #3301988 by Anybody: Fix heading hierarchy in cookies docs block

 set classes = ['cookies-docs']

%}

<section{{ attributes.addClass(classes) }}>

  <h2>{{ label }}</h2>

  <h3>{{ label }}</h3>

  {{ items }}

</section>

  set classes = ['cookies-docs-service']

%}

<article{{ attributes.addClass(classes) }}>

  <h3>{{ label }}</h3>

  <h4>{{ label }}</h4>

  {% if external_link_url %}

    <div class="cookies-docs-service--website">

      <a href="{{ external_link_url }}" target="_blank" rel="nofollow noreferrer" class="cookies-docs-service--official">{{ external_link_text }}</a>