migration-guides: fix 4.2 migration note issues

- Eliminate this warning:
  WARNING: Title underline too short.
- Remove a leftover patch file

(From yocto-docs rev: 15f1f9b234ba81177ff5fafdb3d42c002daffa56)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/0001-manuals-prepare-4.2-migration-notes.patch

@@ -1,134 +0,0 @@
-From 42a8aad2c8b52b1cfbc6c580c689d3c9a7056485 Mon Sep 17 00:00:00 2001
-From: Michael Opdenacker <michael.opdenacker@bootlin.com>
-Date: Tue, 13 Dec 2022 09:57:04 +0100
-Subject: [PATCH] manuals: prepare 4.2 migration notes
-
-Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
----
- documentation/migration-guides/index.rst      |  1 +
- .../migration-guides/migration-4.2.rst        | 48 +++++++++++++++++++
- .../migration-guides/release-4.2.rst          |  9 ++++
- .../migration-guides/release-notes-4.2.rst    | 28 +++++++++++
- 4 files changed, 86 insertions(+)
- create mode 100644 documentation/migration-guides/migration-4.2.rst
- create mode 100644 documentation/migration-guides/release-4.2.rst
- create mode 100644 documentation/migration-guides/release-notes-4.2.rst
-
-diff --git a/documentation/migration-guides/index.rst b/documentation/migration-guides/index.rst
-index ce0ca8c659..6f7bcbef29 100644
---- a/documentation/migration-guides/index.rst
-+++ b/documentation/migration-guides/index.rst
-@@ -12,6 +12,7 @@ to move to one release of the Yocto Project from the previous one.
- .. toctree::
- 
-    migration-general
-+   release-4.2
-    release-4.1
-    release-4.0
-    release-3.4
-diff --git a/documentation/migration-guides/migration-4.2.rst b/documentation/migration-guides/migration-4.2.rst
-new file mode 100644
-index 0000000000..944ad31a4c
---- /dev/null
-+++ b/documentation/migration-guides/migration-4.2.rst
-@@ -0,0 +1,48 @@
-+.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
-+
-+Release 4.2 (mickledore)
-+========================
-+
-+Migration notes for 4.2 (mickledore)
-+------------------------------------
-+
-+This section provides migration information for moving to the Yocto
-+Project 4.2 Release (codename "mickledore") from the prior release.
-+
-+.. _migration-4.2-python-3.8:
-+
-+Python 3.8 is now the minimum required Python version version
-+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~------------
-+
-+BitBake and OpenEmbedded-Core are now relying on Python 3.8,
-+making it a requirement to use a distribution providing at least this
-+version, or to use :term:`buildtools`.
-+
-+.. _migration-4.2-qa-checks:
-+
-+QA check changes
-+~~~~~~~~~~~~~~~~
-+
-+.. _migration-4.2-misc-changes:
-+
-+Miscellaneous changes
-+~~~~~~~~~~~~~~~~~~~~~
-+
-+- The ``OEBasic`` signature handler (see :term:`BB_SIGNATURE_HANDLER`) has been
-+  removed.
-+
-+.. _migration-4.2-removed-variables:
-+
-+Removed variables
-+~~~~~~~~~~~~~~~~~
-+
-+The following variables have been removed:
-+- ``SERIAL_CONSOLE``, deprecated since version 2.6, replaced by :term:``SERIAL_CONSOLES``.
-+
-+.. _migration-4.2-removed-recipes:
-+
-+Removed recipes
-+~~~~~~~~~~~~~~~
-+
-+The following recipes have been removed in this release:
-+
-diff --git a/documentation/migration-guides/release-4.2.rst b/documentation/migration-guides/release-4.2.rst
-new file mode 100644
-index 0000000000..ae52d939c8
---- /dev/null
-+++ b/documentation/migration-guides/release-4.2.rst
-@@ -0,0 +1,9 @@
-+.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
-+
-+Release 4.2 (mickledore)
-+========================
-+
-+.. toctree::
-+
-+   migration-4.2
-+   release-notes-4.2
-diff --git a/documentation/migration-guides/release-notes-4.2.rst b/documentation/migration-guides/release-notes-4.2.rst
-new file mode 100644
-index 0000000000..f3d69d98cc
---- /dev/null
-+++ b/documentation/migration-guides/release-notes-4.2.rst
-@@ -0,0 +1,28 @@
-+.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
-+
-+Release notes for 4.2 (mickledore)
-+---------------------------------
-+
-+New Features / Enhancements in 4.2
-+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-+
-+- Python 3.8 s the minimum Python version required on the build host.
-+  For host distros that do not provide it, this is included as part of the
-+  :term:`buildtools` tarball.
-+
-+- This release now supports a new ``addpylib`` directive to enable
-+  Python libraries within layers.
-+
-+  This directive should be added to your layer configuration,
-+  as in the below example from ``meta/conf/layer.conf``::
-+
-+     addpylib ${LAYERDIR}/lib oe
-+
-+-  Architecture-specific enhancements:
-+
-+-  Kernel-related enhancements:
-+
-+-  QEMU/runqemu enhancements:
-+
-+-  Image-related enhancements:
-+
--- 
-2.37.2
-

documentation/migration-guides/release-notes-4.2.rst

@@ -1,7 +1,7 @@
 .. SPDX-License-Identifier: CC-BY-SA-2.0-UK
 
 Release notes for 4.2 (mickledore)
----------------------------------
+----------------------------------
 
 New Features / Enhancements in 4.2
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~