docs: Update porting guide for ansible 5.9.0 (#77982)

docs/docsite/rst/porting_guides/porting_guide_5.rst

@@ -127,6 +127,36 @@ Networking
 
 No notable changes
 
+Porting Guide for v5.9.0
+========================
+
+Added Collections
+-----------------
+
+- cisco.dnac (version 6.4.0)
+- community.sap_libs (version 1.1.0)
+
+Major Changes
+-------------
+
+fortinet.fortios
+~~~~~~~~~~~~~~~~
+
+- Support FortiOS 7.0.2, 7.0.3, 7.0.4, 7.0.5.
+
+Deprecated Features
+-------------------
+
+- The collection ``community.sap`` has been renamed to ``community.sap_libs``. For now both collections are included in Ansible. The content in ``community.sap`` will be replaced with deprecated redirects to the new collection in Ansible 7.0.0, and these redirects will eventually be removed from Ansible. Please update your FQCNs for ``community.sap``.
+
+community.docker
+~~~~~~~~~~~~~~~~
+
+- Support for Ansible 2.9 and ansible-base 2.10 is deprecated, and will be removed in the next major release (community.docker 3.0.0). Some modules might still work with these versions afterwards, but we will no longer keep compatibility code that was needed to support them (https://github.com/ansible-collections/community.docker/pull/361).
+- The dependency on docker-compose for Execution Environments is deprecated and will be removed in community.docker 3.0.0. The `Python docker-compose library <https://pypi.org/project/docker-compose/>`__ is unmaintained and can cause dependency issues. You can manually still install it in an Execution Environment when needed (https://github.com/ansible-collections/community.docker/pull/373).
+- Various modules - the default of ``tls_hostname`` that was supposed to be removed in community.docker 2.0.0 will now be removed in version 3.0.0 (https://github.com/ansible-collections/community.docker/pull/362).
+- docker_stack - the return values ``out`` and ``err`` that were supposed to be removed in community.docker 2.0.0 will now be removed in version 3.0.0 (https://github.com/ansible-collections/community.docker/pull/362).
+
 Porting Guide for v5.8.0
 ========================