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>

1 files changed, 1 insertions, 1 deletions

diff --git a/documentation/migration-guides/migration-1.3.rst b/documentation/migration-guides/migration-1.3.rst
index 9a1539172e..6a1755d1dc 100644
--- a/documentation/migration-guides/migration-1.3.rst
+++ b/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