[changelog] Classify all non user-facing changes as 'internal'

Author: Pierre-Sassoulas

doc/whatsnew/fragments/8181.breaking renamed to doc/whatsnew/fragments/8181.feature

@@ -1,9 +1,5 @@
 Everything related to the ``__implements__`` construct was removed. It was based on PEP245
-that was proposed in 2001 and rejected in 2006. It includes all the classes inheriting
-``Interface`` in ``pylint.interfaces``
-
-``Checker`` should only inherit ``BaseChecker`` or any of the other checker types from ``pylint.checkers``.
-``Reporter`` should only inherit ``BaseReporter``.
+that was proposed in 2001 and rejected in 2006.
 
 The capability from pyreverse to take ``__implements__`` into account when generating diagrams
 was also removed.

doc/whatsnew/fragments/8401.breaking renamed to doc/whatsnew/fragments/8401.internal

@@ -0,0 +1,8 @@
+Everything related to the ``__implements__`` construct was removed. It was based on PEP245
+that was proposed in 2001 and rejected in 2006.
+
+All the classes inheriting ``Interface`` in ``pylint.interfaces`` were removed.
+``Checker`` should only inherit ``BaseChecker`` or any of the other checker types
+from ``pylint.checkers``. ``Reporter`` should only inherit ``BaseReporter``.
+
+Refs #8404