attempted fix to lint only changed files

[m4sterbunny]

Last attempt to lint only changed files on pr was a fail, this is an attempted fix

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Note

Low Risk
Low risk CI-only change that adjusts file matching and separators; main risk is accidentally linting too many/few docs files due to glob/separator configuration.

Overview
Updates the docs-spelling-check composite action to better lint only changed docs content by switching tj-actions/changed-files to explicit **/*.md/**/*.mdx globs and using newline-based separators.

Passes the newline-separated changed file list into Vale and configures Vale’s separator accordingly, removing the previously-defined FILEPATHS input and comma-separated parsing.

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