<h3>Contribution description</h3>
<p><a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="403433979" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/10876" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/10876/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/10876">#10876</a> reorganized the nanocoap documentation to move text specific to nanocoap_sock to that module. Unfortunately, the instruction to add CoAP options in order by option number was lost. This PR reinserts that instruction in the top level documentation for nanocoap, as well as in the module specific documentation in nanocoap sock and gcoap.</p>
<h3>Testing procedure</h3>
<p>Build and compare the updated source documentation. There are changes to the nanocoap, nanocoap sock, and gcoap pages.</p>
<h3>Issues/PRs references</h3>
<p>Fixes the loss of this documentation in <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="403433979" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/10876" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/10876/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/10876">#10876</a>.</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/12234'>https://github.com/RIOT-OS/RIOT/pull/12234</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>net/nanocoap: reinsert doc to add options in order</li>
  <li>net/gcoap: insert doc to add options in order</li>
  <li>net/nanocoap_sock: insert doc to add options in order</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/12234/files#diff-0">sys/include/net/gcoap.h</a>
    (12)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/12234/files#diff-1">sys/include/net/nanocoap.h</a>
    (3)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/12234/files#diff-2">sys/include/net/nanocoap_sock.h</a>
    (3)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/12234.patch'>https://github.com/RIOT-OS/RIOT/pull/12234.patch</a></li>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/12234.diff'>https://github.com/RIOT-OS/RIOT/pull/12234.diff</a></li>
</ul>

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