manuals: simplify references to class sections

Replace
":ref:`classname.bbclass <ref-classes-classname>`" section
by
":ref:`ref-classes-classname`" section
because each section has "classname.bbclass" as title,
therefore the result is the same.

(From yocto-docs rev: e3f438e4a71b155bd09bc7988c8e5626a063fde3)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Reviewed-by: Quentin Schulz <foss+yocto@0leil.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/migration-guides/migration-1.3.rst

@@ -113,7 +113,7 @@ recipes to ``packagegroup-*``, and change them to inherit
 to remove anything now handled by ``packagegroup.bbclass``, such as
 providing ``-dev`` and ``-dbg`` packages, setting
 :term:`LIC_FILES_CHKSUM`, and so forth. See the
-":ref:`packagegroup.bbclass <ref-classes-packagegroup>`" section for
+:ref:`ref-classes-packagegroup` section for
 further details.
 
 .. _migration-1.3-image-features:

documentation/migration-guides/migration-1.5.rst

@@ -87,8 +87,7 @@ The following changes have been made to the package QA checks:
    item not mentioned in :term:`ERROR_QA` or :term:`WARN_QA` would be treated as
    a warning. Consequently, several important items were not already in
    the default value of :term:`WARN_QA`. All of the possible QA checks are
-   now documented in the ":ref:`insane.bbclass <ref-classes-insane>`"
-   section.
+   now documented in the ":ref:`ref-classes-insane`" section.
 
 -  An additional QA check has been added to check if
    ``/usr/share/info/dir`` is being installed. Your recipe should delete
@@ -102,8 +101,7 @@ The following changes have been made to the package QA checks:
    and still wish to have this check performed, you should add
    "version-going-backwards" to your value for one or the other
    variables depending on how you wish it to be handled. See the
-   documented QA checks in the
-   ":ref:`insane.bbclass <ref-classes-insane>`" section.
+   documented QA checks in the ":ref:`ref-classes-insane`" section.
 
 .. _migration-1.5-directory-layout-changes:
 
@@ -222,8 +220,7 @@ recipes that previously inherited from this class, you should rename
 them from ``task-*`` to ``packagegroup-*`` and inherit packagegroup
 instead.
 
-For more information, see the
-":ref:`packagegroup.bbclass <ref-classes-packagegroup>`" section.
+For more information, see the ":ref:`ref-classes-packagegroup`" section.
 
 .. _migration-1.5-busybox:
 

documentation/migration-guides/migration-1.6.rst

@@ -222,8 +222,7 @@ Package Tests (ptest) are built but not installed by default. For
 information on using Package Tests, see the
 ":ref:`dev-manual/common-tasks:testing packages with ptest`"
 section in the Yocto Project Development Tasks Manual. For information on the
-``ptest`` class, see the ":ref:`ptest.bbclass <ref-classes-ptest>`"
-section.
+``ptest`` class, see the ":ref:`ref-classes-ptest`" section.
 
 .. _migration-1.6-build-changes: