refactor(developer): remove non used changelog sections

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

Author: susnux

developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_25.rst

@@ -49,11 +49,6 @@ The `christophwurst/nextcloud <https://packagist.org/packages/christophwurst/nex
 with a now Nextcloud owned `nextcloud/ocp <https://packagist.org/packages/nextcloud/ocp>`_ package. The content is the
 same and all older versions were generated, so you can transition right away no matter which versions you support.
 
-Changed APIs
-^^^^^^^^^^^^
-
-tbd
-
 Removed APIs
 ^^^^^^^^^^^^
 

developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_28.rst

@@ -41,11 +41,6 @@ Added APIs
   * ``files:node:moved``: the node has been moved (and its data is already updated)
   * ``files:node:updated``: the node data has been updated
 
-Changed APIs
-^^^^^^^^^^^^
-
-* tbd
-
 Deprecated APIs
 ^^^^^^^^^^^^^^^
 

developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_32.rst

@@ -45,27 +45,12 @@ Icons should be outlined
 
 When using Material Icons, use the outlined variant where possible. Exceptions to this are app icons themselves, file type icons, as well as icons that were already a single line, such as the plus or checkmark icons. Reasoning and more details are in `the issue <https://github.com/nextcloud/server/issues/53701>`_.
 
-Added APIs
-^^^^^^^^^^
-
-- TBD
-
-Changed APIs
-^^^^^^^^^^^^
-
-- TBD
-
 Deprecated APIs
 ^^^^^^^^^^^^^^^
 
 - ``--color-error-rgb``, ``--color-info-rgb``, ``--color-success-rgb``, ``--color-warning-rgb`` are deprecated.
   Instead use the native CSS color utils with the the existing variables like ``--color-error`` and similar.
 
-Removed APIs
-^^^^^^^^^^^^
-
-- TBD
-
 Back-end changes
 ----------------