Remove core key from example info file
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3318804. -->
Reported by: [jhedstrom](https://www.drupal.org/user/208732)
Related to !13
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>The <code>core</code> key is still present in the info file.</p>
issue