Update removed-backward-incompatibility.md

[brianteeman]

PR Type

Documentation

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Description

• Added documentation entry about backward incompatibility change in mod_breadcrumbs module
• Documented the removal of setSeparator method which was unused since Joomla 4.0
• Included reference to the original PR and affected file for traceability

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Changes walkthrough 📝

	Relevant files
Documentation	removed-backward-incompatibility.md Document removal of breadcrumbs separator setter method    migrations/54-60/removed-backward-incompatibility.md Added documentation about the removal of setSeparator method in mod_breadcrumbs Included reference to PR #44605 and affected file path Documented that the feature was unused since 4.0 and removed without replacement +6/-0

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⚡ Recommended focus areas for review Documentation Clarity The documentation should clarify if there are any alternative approaches for customizing breadcrumb separators in Joomla 5.x/6.x since the setSeparator method was removed

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