<h3>Contribution description</h3>
<p>This PR adds minimal documentation to remove gnrc_tcp related warnings from the doxygen static test.</p>
<h3>Testing procedure</h3>
<p>This PR is tested by running</p>
<div class="snippet-clipboard-content position-relative" data-snippet-clipboard-copy-content="make static-test | grep gnrc_tcp
"><pre><code>make static-test | grep gnrc_tcp
</code></pre></div>
<p>If there is no output, the test is successful.</p>
<h3>Issues/PRs references</h3>
<p>None</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/RIOT-OS/RIOT/pull/16736'>https://github.com/RIOT-OS/RIOT/pull/16736</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>gnrc_tcp: Document internal defines</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/16736/files#diff-a47b8b470e927ed8f5ca7691f9dc074cd1b76d008e37ba3119d909380757f116">sys/net/gnrc/transport_layer/tcp/include/gnrc_tcp_common.h</a>
    (62)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/16736.patch'>https://github.com/RIOT-OS/RIOT/pull/16736.patch</a></li>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/16736.diff'>https://github.com/RIOT-OS/RIOT/pull/16736.diff</a></li>
</ul>

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