refactor: rename addMarkdownHighlighter to setMarkdownHighlighter (Fixes #3105) #3879
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Description
This PR updates the Markdown syntax highlighter API for greater clarity and consistency:
✨ Introduced setMarkdownHighlighter() — a clearer, more intuitive method name.
📚 Updated README.md to reflect the new API and include a note about the deprecation.
🧪 Added a new AVA test (user-config-deprecation.test.js) to verify both backward compatibility and warning output.
✅ All existing tests pass successfully. No example configuration updates are required.
✅ Closes [#3105]