pr: add CHANGELOG entry for this PR

CHANGELOG.md

@@ -4,6 +4,7 @@
 ### Enhancements
 
 * **Adds data source properties to Airtable, Confluence and Discord connectors** These properties (date_created, date_modified, version, source_url, record_locator) are written to element metadata during ingest, mapping elements to information about the document source from which they derive. This functionality enables downstream applications to reveal source document applications, e.g. a link to a GDrive doc, Salesforce record, etc.
+* **DOCX partitioner refactored in preparation for enhancement.** Behavior should be unchanged except in multi-section documents containing different headers/footers for different sections. These will now emit all distinct headers and footers encountered instead of just those for the last section.
 
 ### Features