Maintainer release notes: handle issue fork and merge requests

[FlorentTorregrosa]

Hello,

When using the issue fork and merge requests workflow, the git commit command provided does not include the user's pseudo in the commit message.

So the command "mrn" does not added those as contributors:

https://git.drupalcode.org/project/entity_share/-/commits/8.x-3.x between 8.x-3.0-beta2 and 8.x-3.0-beta3, the command outputs:

<h3>Contributors (3)</h3>
<p><a href="https://www.drupal.org/u/grimreaper">Grimreaper</a>, <a href="https://www.drupal.org/u/ivan.vujovic">ivan.vujovic</a>, <a href="https://www.drupal.org/u/harpreet16">harpreet16</a></p>
<h3>Changelog</h3>
<p><strong>Issues:</strong> 3 issues resolved.</p>
<p>Changes since <a href="https://www.drupal.org/project/entity_share/releases/8.x-3.0-beta2">8.x-3.0-beta2</a>:</p>
<h4>Feature</h4>
<ul>
  <li><a href="https://www.drupal.org/node/2856719">#2856719</a> by <a href="https://www.drupal.org/u/grimreaper">Grimreaper</a>, <a href="https://www.drupal.org/u/ivan.vujovic">ivan.vujovic</a>, <a href="https://www.drupal.org/u/harpreet16">harpreet16</a>: Diff on entities</li>
</ul>
<h4>Task</h4>
<ul>
  <li><a href="https://www.drupal.org/node/3195854">#3195854</a>: Fix rector error</li>
  <li><a href="https://www.drupal.org/node/3192579">#3192579</a>: Fix PHPCs errors</li>
</ul>

https://git.drupalcode.org/project/entity_share/-/commit/576409693142b84b233cca4bb982c81006d4ee4e
and
https://git.drupalcode.org/project/entity_share/-/commit/c6876a3e3f9a79677a59454efba1935c037ca251

are not detected.

Thanks for any help.