docs: add info about handling exceptions for non-HTML responses (#9310)

Author: michalsn

user_guide_src/source/changelogs/v4.6.0.rst

@@ -183,6 +183,8 @@ The following new Exception interfaces have been added:
 - ``CodeIgniter\HTTP\Exceptions\ExceptionInterface``
 - ``CodeIgniter\Router\Exceptions\ExceptionInterface``
 
+Displaying exceptions for non-HTML responses now rely on the PHP ``display_errors`` setting instead of hardcoded environments.
+
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