manuals: improve references to classes

- Simplify references to class sections, by replacing references such as
  :ref:`image.bbclass <ref-classes-image>`
  by
  :ref:`ref-classes-image`

  That's equivalent, because the class sections always called <class>.bbclass

- Adding references to class sections, by replacing strings such as
  ``image.bbclass``
  by
  :ref:`ref-classes-image`

- Simplifying a few class section links

(From yocto-docs rev: 29d66aaa898390c19f121baf0f4fdcc178e4cd80)

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

documentation/migration-guides/migration-1.3.rst

@@ -110,7 +110,7 @@ references in your own recipes and configurations as they could be
 removed in future releases. You should also rename any custom ``task-*``
 recipes to ``packagegroup-*``, and change them to inherit
 ``packagegroup`` instead of ``task``, as well as taking the opportunity
-to remove anything now handled by ``packagegroup.bbclass``, such as
+to remove anything now handled by :ref:`ref-classes-packagegroup`, such as
 providing ``-dev`` and ``-dbg`` packages, setting
 :term:`LIC_FILES_CHKSUM`, and so forth. See the
 :ref:`ref-classes-packagegroup` section for

documentation/migration-guides/migration-1.5.rst

@@ -240,7 +240,7 @@ Automated Image Testing
 -----------------------
 
 A new automated image testing framework has been added through the
-:ref:`testimage.bbclass <ref-classes-testimage*>` class. This
+:ref:`ref-classes-testimage*` classes. This
 framework replaces the older ``imagetest-qemu`` framework.
 
 You can learn more about performing automated image tests in the
@@ -341,7 +341,7 @@ Following is a list of short entries describing other changes:
 
 -  ``libpam``: Deny all services for the ``OTHER`` entries.
 
--  ``image.bbclass``: Move ``runtime_mapping_rename`` to avoid conflict
+-  :ref:`ref-classes-image`: Move ``runtime_mapping_rename`` to avoid conflict
    with ``multilib``. See :yocto_bugs:`YOCTO #4993 </show_bug.cgi?id=4993>`
    in Bugzilla for more information.
 

documentation/migration-guides/migration-2.2.rst

@@ -439,7 +439,7 @@ The following miscellaneous changes have occurred:
 
 -  ``packagegroup-core-tools-testapps``: Removed Piglit.
 
--  :ref:`image.bbclass <ref-classes-image>`: Renamed COMPRESS(ION) to CONVERSION. This change
+-  :ref:`ref-classes-image`: Renamed COMPRESS(ION) to CONVERSION. This change
    means that ``COMPRESSIONTYPES``, ``COMPRESS_DEPENDS`` and
    ``COMPRESS_CMD`` are deprecated in favor of ``CONVERSIONTYPES``,
    ``CONVERSION_DEPENDS`` and ``CONVERSION_CMD``. The ``COMPRESS*``

documentation/migration-guides/migration-2.3.rst

@@ -304,8 +304,7 @@ The following package management changes took place:
    This change was made because too many places in DNF/RPM4 stack
    already make that assumption. Only the filenames and the architecture
    tag has changed. Nothing else has changed in OE-core system,
-   particularly in the :ref:`allarch.bbclass <ref-classes-allarch>`
-   class.
+   particularly in the :ref:`ref-classes-allarch` class.
 
 -  Signing of remote package feeds using ``PACKAGE_FEED_SIGN`` is not
    currently supported. This issue will be fully addressed in a future

documentation/migration-guides/migration-3.5.rst

@@ -52,5 +52,5 @@ Recipe changes
   and :ref:`bitbake:bitbake-user-manual/bitbake-user-manual-metadata:removal (override style syntax)`.
 
 - :ref:`allarch <ref-classes-allarch>` packagegroups can no longer depend on packages
-  which use :term:`PKG` renaming such as :ref:`debian.bbclass <ref-classes-debian>`.
+  which use :term:`PKG` renaming such as :ref:`ref-classes-debian`.