fixup

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

Author: susnux

developer_manual/release_notes/critical_changes.rst

@@ -48,7 +48,6 @@ Make sure to adjust your CI matrix for testing with them. This is automatically
     this will break as the GROUP BY clause will self reference the alias ``b``.
     Using a different alias name will fix MariaDB but not all other database systems, as then the cast expression is missing from the GROUP BY clause.
     So make this work on all supported database systems you need to use a subquery:
-    
     .. code-block:: sql
 
       SELECT `a`, `b`