migration-guides: add placeholder files for next release

Placeholder files for release 5.2 (Walnascar): migration guide and
release notes.

Define two substitutions |yocto-ver| and |yocto-codename| to avoid
mistakes in the document. Note that anchors cannot contain these so
add a note on that in a comment.

Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
(From yocto-docs rev: f13492dc9474b7e22d01ab1bec2da074e972965d)

Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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-5.2
    release-5.1
    release-5.0
    release-4.3

documentation/migration-guides/migration-5.2.rst

@@ -0,0 +1,59 @@
+.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
+
+.. |yocto-codename| replace:: walnascar
+.. |yocto-ver| replace:: 5.2
+.. Note: anchors id below cannot contain substitutions so replace them with the
+   value of |yocto-ver| above.
+
+Release |yocto-ver| (|yocto-codename|)
+======================================
+
+Migration notes for |yocto-ver| (|yocto-codename|)
+--------------------------------------------------
+
+This section provides migration information for moving to the Yocto
+Project |yocto-ver| Release (codename "|yocto-codename|") from the prior release.
+
+Supported kernel versions
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The :term:`OLDEST_KERNEL` setting is XXX in this release, meaning that
+out the box, older kernels are not supported. See :ref:`4.3 migration notes
+<migration-4.3-supported-kernel-versions>` for details.
+
+Supported distributions
+~~~~~~~~~~~~~~~~~~~~~~~
+
+Compared to the previous releases, running BitBake is supported on new
+GNU/Linux distributions:
+
+On the other hand, some earlier distributions are no longer supported:
+
+See :ref:`all supported distributions <system-requirements-supported-distros>`.
+
+Go language changes
+~~~~~~~~~~~~~~~~~~~
+
+systemd changes
+~~~~~~~~~~~~~~~
+
+Recipe changes
+~~~~~~~~~~~~~~
+
+Removed variables
+~~~~~~~~~~~~~~~~~
+
+The following variables have been removed:
+
+Removed recipes
+~~~~~~~~~~~~~~~
+
+The following recipes have been removed in this release:
+
+Removed classes
+~~~~~~~~~~~~~~~
+
+The following classes have been removed in this release:
+
+Miscellaneous changes
+~~~~~~~~~~~~~~~~~~~~~

documentation/migration-guides/release-5.2.rst

@@ -0,0 +1,9 @@
+.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
+
+Release 5.2 (walnascar)
+=======================
+
+.. toctree::
+
+   migration-5.2
+   release-notes-5.2

documentation/migration-guides/release-notes-5.2.rst

@@ -0,0 +1,65 @@
+.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
+
+.. |yocto-codename| replace:: walnascar
+.. |yocto-ver| replace:: 5.2
+
+Release notes for |yocto-ver| (|yocto-codename|)
+------------------------------------------------
+
+New Features / Enhancements in |yocto-ver|
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+-  Linux kernel 6.XXX, gcc 14.XXX, glibc 2.XXX, LLVM 18.1.XXX, and over XXX other
+   recipe upgrades.
+
+-  New variables:
+
+-  Kernel-related changes:
+
+-  New core recipes:
+
+-  QEMU / ``runqemu`` changes:
+
+-  Go changes:
+
+-  Rust changes:
+
+-  wic Image Creator changes:
+
+-  SDK-related changes:
+
+-  Testing-related changes:
+
+-  Utility script changes:
+
+-  BitBake changes:
+
+-  Packaging changes:
+
+-  Security changes:
+
+-  LLVM related changes:
+
+-  SPDX-related changes:
+
+-  Miscellaneous changes:
+
+Known Issues in |yocto-ver|
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Recipe License changes in |yocto-ver|
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The following corrections have been made to the :term:`LICENSE` values set by recipes:
+
+Security Fixes in |yocto-ver|
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Recipe Upgrades in |yocto-ver|
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Contributors to |yocto-ver|
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Repositories / Downloads for Yocto-|yocto-ver|
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~