Modify api spec description of create postmortem attachment (#3137)

Co-authored-by: ci.datadog-api-spec <packages@datadoghq.com> a5ed8d1

Author: api-clients-generation-pipeline[bot]

datadog_api_client.v2.api.html

@@ -8548,6 +8548,9 @@ <h2 id="submodules">Submodules<a class="headerlink" href="#submodules" title="Li
 <span class="sig-name descname"><span class="pre">create_incident_postmortem_attachment</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">incident_id</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">str</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">body</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference internal" href="datadog_api_client.v2.model.html#datadog_api_client.v2.model.postmortem_attachment_request.PostmortemAttachmentRequest" title="datadog_api_client.v2.model.postmortem_attachment_request.PostmortemAttachmentRequest"><span class="pre">PostmortemAttachmentRequest</span></a></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">→</span> <span class="sig-return-typehint"><a class="reference internal" href="datadog_api_client.v2.model.html#datadog_api_client.v2.model.attachment.Attachment" title="datadog_api_client.v2.model.attachment.Attachment"><span class="pre">Attachment</span></a></span></span><a class="headerlink" href="#datadog_api_client.v2.api.incidents_api.IncidentsApi.create_incident_postmortem_attachment" title="Link to this definition">¶</a></dt>
 <dd><p>Create postmortem attachment.</p>
 <p>Create a postmortem attachment for an incident.</p>
+<p>The endpoint accepts markdown for notebooks created in Confluence or Google Docs.
+Postmortems created from notebooks need to be formatted using frontend notebook cells,
+in addition to markdown format.</p>
 <dl class="field-list simple">
 <dt class="field-odd">Parameters<span class="colon">:</span></dt>
 <dd class="field-odd"><p><strong>incident_id</strong> (<em>str</em>) – The ID of the incident</p>