doc: Changelog entry for bids-standardgh-323

Author: effigies

changelog.d/20260108_164710_markiewicz.md

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+### Added
+
+- Display validation summaries for derivative datasets when recursive validation
+  (`-r`/`--recursive`) is run.
+
+-->
+<!--
+### Changed
+
+- A bullet item for the Changed category.
+
+-->
+<!--
+### Fixed
+
+- A bullet item for the Fixed category.
+
+-->
+<!--
+### Deprecated
+
+- A bullet item for the Deprecated category.
+
+-->
+<!--
+### Removed
+
+- A bullet item for the Removed category.
+
+-->
+<!--
+### Security
+
+- A bullet item for the Security category.
+
+-->
+<!--
+### Infrastructure
+
+- A bullet item for the Infrastructure category.
+
+-->