Remove LegacyErrorHandlingTrait from CategoryNode & Changelog

[Hackwar]

User description

This is the documentation PR for joomla/joomla-cms#43777

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PR Type

Documentation, Enhancement

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Description

• Removed LegacyErrorHandlingTrait from CategoryNode and Changelog classes.

• Updated documentation to reflect the removal of the deprecated trait.

• Added details about the change in the migration guide.

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Changes walkthrough 📝

	Relevant files
Documentation	removed-backward-incompatibility.md Document removal of LegacyErrorHandlingTrait in migration guide migrations/54-60/removed-backward-incompatibility.md Documented removal of LegacyErrorHandlingTrait from CategoryNode and Changelog. Provided PR reference and description of the change. Updated migration guide for version 6.0. +7/-0

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