docs: Update changelog

Author: neznaika0

user_guide_src/source/changelogs/v4.5.6.rst

@@ -29,6 +29,10 @@ Deprecations
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 Bugs Fixed
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+- **FeatureTestTrait:** Allows `#call` and `#post` to process JSON lists. It failed because `RequestTrait#fetchGlobal` expected the second parameter ($index) to be an associative array.
+
+- **RequestTrait:** Allows to get a value by a numeric key if the data is stored as a list and not an associative array.
+
 - **Session Library:** The session initialization debug message now uses the correct log type "debug" instead of "info".
 
 - **Validation:** Fixed the `getValidated()` method that did not return valid data when validation rules used multiple asterisks.