update docs for develop

develop/plugins/environment_variables.html

@@ -81,7 +81,7 @@
   <section id="index-of-all-collection-environment-variables">
 <span id="list-of-collection-env-vars"></span><h1>Index of all Collection Environment Variables<a class="headerlink" href="#index-of-all-collection-environment-variables" title="Link to this heading"></a></h1>
 <p>The following index documents all environment variables declared by plugins in collections.
-Environment variables used by the ansible-core configuration are documented in <a class="reference external" href="https://docs.ansible.com/ansible/latest/reference_appendices/config.html#ansible-configuration-settings" title="(in Ansible v8)"><span>Ansible Configuration Settings</span></a>.</p>
+Environment variables used by the ansible-core configuration are documented in <a class="reference external" href="https://docs.ansible.com/ansible/latest/reference_appendices/config.html#ansible-configuration-settings" title="(in Ansible v9)"><span>Ansible Configuration Settings</span></a>.</p>
 <p>No environment variables have been defined.</p>
 </section>