add release note snippet for Croissant 1.1 #12014

Author: pdurbin

doc/release-notes/12014-croissant-1.1.md

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+### Croissant 1.1 (Summary Statistics)
+
+The Croissant metadata export format has been updated from version 1.0 to 1.1.
+
+Summary statistics (mean, min, max, etc.) are now included for tabular files that were successfully ingested.
+
+You can download an example Croissant file from the [Supported Metadata Export Formats](https://dataverse-guide--12214.org.readthedocs.build/en/12214/user/dataset-management.html#supported-metadata-export-formats) section of the guides.
+
+Minor backward-incompatible changes were made, which are noted below.
+
+See #12014 and #12214
+
+## Backward Incompatible Changes
+
+Generally speaking, see the [API Changelog](https://guides.dataverse.org/en/latest/api/changelog.html) for a list of backward-incompatible API changes.
+
+Minor changes in the `croissant` format are noted in the [API changelog](https://dataverse-guide--12214.org.readthedocs.build/en/12214/api/changelog.html).
+
+## Upgrade Instructions
+
+1. Re-export metadata export formats
+
+   We re-export because the Croissant format was updated.
+
+   `curl http://localhost:8080/api/admin/metadata/reExportAll`