Added 2.18 porting guide (#2076)

* Added 2.18 porting guide

* Removed assertion change from porting guide

* Apply suggestions from code review

Co-authored-by: Sandra McCann <[email protected]>

---------

Co-authored-by: Sandra McCann <[email protected]>

docs/docsite/rst/porting_guides/core_porting_guides.rst

@@ -12,6 +12,7 @@ Please note that this is not a complete list. If you believe any extra informati
    :maxdepth: 1
    :glob:
 
+   porting_guide_core_2.18
    porting_guide_core_2.17
    porting_guide_core_2.16
    porting_guide_core_2.15

docs/docsite/rst/porting_guides/porting_guide_core_2.18.rst

@@ -0,0 +1,99 @@
+
+.. _porting_2.18_guide_core:
+
+*******************************
+Ansible-core 2.18 Porting Guide
+*******************************
+
+This section discusses the behavioral changes between ``ansible-core`` 2.17 and ``ansible-core`` 2.18.
+
+It is intended to assist in updating your playbooks, plugins and other parts of your Ansible infrastructure so they will work with this version of Ansible.
+
+We suggest you read this page along with `ansible-core Changelog for 2.18 <https://github.com/ansible/ansible/blob/stable-2.18/changelogs/CHANGELOG-v2.18.rst>`_ to understand what updates you may need to make.
+
+This document is part of a collection on porting. The complete list of porting guides can be found at :ref:`porting guides <porting_guides>`.
+
+.. contents:: Topics
+
+
+Playbook
+========
+
+No notable changed
+
+
+Command Line
+============
+
+* Python 3.10 is a no longer supported control node version. Python 3.11+ is now required for running Ansible.
+* Python 3.7 is a no longer supported remote version. Python 3.8+ is now required for target execution.
+
+
+Deprecated
+==========
+
+No notable changes
+
+
+Modules
+=======
+
+No notable changes
+
+
+Modules removed
+---------------
+
+The following modules no longer exist:
+
+* No notable changes
+
+
+Deprecation notices
+-------------------
+
+No notable changes
+
+
+Noteworthy module changes
+-------------------------
+
+No notable changes
+
+
+Plugins
+=======
+
+* The ``ssh`` connection plugin now officially supports targeting Windows hosts. A
+  breaking change that has been made as part of this official support is the low level command
+  execution done by plugins like ``ansible.builtin.raw`` and action plugins calling
+  ``_low_level_execute_command`` is no longer wrapped with a ``powershell.exe`` wrapped
+  invocation. These commands will now be executed directly on the target host using
+  the default shell configuration set on the Windows host. This change is done to
+  simplify the configuration required on the Ansible side, make module execution more
+  efficient, and to remove the need to decode stderr CLIXML output. A consequence of this
+  change is that ``ansible.builtin.raw`` commands are no longer guaranteed to be
+  run through a PowerShell shell and with the output encoding of UTF-8. To run a command
+  through PowerShell and with UTF-8 output support, use the ``ansible.windows.win_shell``
+  or ``ansible.windows.win_powershell`` module instead.
+
+  .. code-block:: yaml
+
+      - name: Run with win_shell
+        ansible.windows.win_shell: Write-Host "Hello, Café"
+
+      - name: Run with win_powershell
+        ansible.windows.win_powershell:
+          script: Write-Host "Hello, Café"
+
+
+Porting custom scripts
+======================
+
+No notable changes
+
+
+Networking
+==========
+
+No notable changes