Added: release notes for IQSS#11921

Author: GPortas

doc/release-notes/11921-dataset-version-summaries-metadatacount-fix.md

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+### Dataset version summaries API changedFileMetaData count fix
+
+The endpoint ``{id}/versions/compareSummary`` was previously returning an incorrect count for
+the ``changedFileMetaData`` field.
+The logic for calculating this count has been fixed to accurately reflect the total number of file metadata changes
+across all files in the dataset version.
+
+### Related issues
+
+- https://github.com/IQSS/dataverse/issues/11921