add core 2.19 docs to package docs (#3050) (#3051)

(cherry picked from commit da8ec25)

Author: samccann

docs/docsite/.templates/banner.html

@@ -38,13 +38,17 @@
       var msg = '<p>';
       if (startsWith(current_url_path, "/ansible-core/")) {
         msg += 'You are reading documentation for Ansible Core, which contains no plugins except for those in ansible.builtin. For documentation of the Ansible package, go to <a href="/ansible/latest">the latest documentation</a>.';
-        /* temp - add extra warning about core-2.19. This should move to latest at release time */
+        /* temp - add extra warning about core-2.19. Included in core 2.19 and later releases */
         msg += '<br><p><strong>Important:</strong> The ansible-core 2.19 release has made <b>significant templating changes that might require you to update playbooks and roles</b>. The templating changes enable reporting of numerous problematic behaviors that went undetected in previous releases, with wide-ranging positive effects on security, performance, and user experience. You should validate your content to ensure compatibility with these templating changes before upgrading to ansible-core 2.19. See the <a href="https://docs.ansible.com/ansible/devel/porting_guides/porting_guide_12.html">porting guide</a> to understand where you may need to update your playbooks and roles.';
       } else if (startsWithOneOf(current_url_path, ["/ansible/latest/", "/ansible/{{ latest_version }}/"])) {
         /* temp extra banner to advertise something */
         banner += extra_banner;
 
         msg += 'This is the <b>latest</b> (stable) Ansible community documentation. For Red Hat Ansible Automation Platform subscriptions, see <a href="https://access.redhat.com/support/policy/updates/ansible-automation-platform">Life Cycle</a> for version details.';
+        /* temp - add extra warning about core-2.19. Included in latest package release docs */
+ 
+        msg += '<br><p><strong>Important:</strong> The ansible-core 2.19/Ansible 12 release has made <b>significant templating changes that might require you to update playbooks and roles</b>. The templating changes enable reporting of numerous problematic behaviors that went undetected in previous releases, with wide-ranging positive effects on security, performance, and user experience. You should validate your content to ensure compatibility with these templating changes before upgrading to ansible-core 2.19 or Ansible 12. See the <a href="https://docs.ansible.com/ansible/devel/porting_guides/porting_guide_12.html">porting guide</a> to understand where you may need to update your playbooks and roles.';
+
       } else if (startsWith(current_url_path, "/ansible/2.9/")) {
         msg += 'You are reading the latest Red Hat released version of the Ansible documentation. Community users can use this version, or select <b>latest</b> from the version selector to the left for the most recent community version.';
       } else if (startsWith(current_url_path, "/ansible/devel/")) {