doc: Add changelog entry

Author: effigies

changelog.d/20250530_082223_markiewicz_multi_inheritance.md

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+<!--
+A new scriv changelog fragment.
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+
+### Added
+
+- Support multi-inheritance for associated files.
+  This will allow for multiple `electrodes.tsv` files,
+  distinguished by the `space-` entity. ([#206] [#207])
+
+[#206]: https://github.com/bids-standard/bids-validator/issues/206
+[#207]: https://github.com/bids-standard/bids-validator/pull/207
+
+<!--
+### Changed
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