docs: Update porting guide for ansible 5.7.0 (#77646)

docs/docsite/rst/porting_guides/porting_guide_5.rst

@@ -127,6 +127,31 @@ Networking
 
 No notable changes
 
+Porting Guide for v5.7.0
+========================
+
+Major Changes
+-------------
+
+community.postgresql
+~~~~~~~~~~~~~~~~~~~~
+
+- postgresql_user - the ``priv`` argument has been deprecated and will be removed in ``community.postgresql 3.0.0``. Please use the ``postgresql_privs`` module to grant/revoke privileges instead (https://github.com/ansible-collections/community.postgresql/issues/212).
+
+fortinet.fortios
+~~~~~~~~~~~~~~~~
+
+- Support FortiOS 7.0.2, 7.0.3, 7.0.4, 7.0.5.
+
+Deprecated Features
+-------------------
+
+community.general
+~~~~~~~~~~~~~~~~~
+
+- nmcli - deprecate default hairpin mode for a bridge. This so we can change it to ``false`` in community.general 7.0.0, as this is also the default in ``nmcli`` (https://github.com/ansible-collections/community.general/pull/4334).
+- proxmox inventory plugin - the current default ``true`` of the ``want_proxmox_nodes_ansible_host`` option has been deprecated. The default will change to ``false`` in community.general 6.0.0. To keep the current behavior, explicitly set ``want_proxmox_nodes_ansible_host`` to ``true`` in your inventory configuration. We suggest to already switch to the new behavior by explicitly setting it to ``false``, and by using ``compose:`` to set ``ansible_host`` to the correct value. See the examples in the plugin documentation for details (https://github.com/ansible-collections/community.general/pull/4466).
+
 Porting Guide for v5.6.0
 ========================