[WIP] release: v12.0 - add signposting

docs/releases/versions/version-v12.0.0.md

@@ -121,6 +121,7 @@ Here is a quick summary of the myriad other improvements in this release:
 - Enable/disable metadata-only records at the instance-level via the `RDM_ALLOW_METADATA_ONLY_RECORDS` configuration variable
 - Enable/disable restricted records at the instance-level via the `RDM_ALLOW_RESTRICTED_RECORDS` configuration variable
 - [New export formats](../../reference/export_formats.md) such as DACT-AP and GeoJSON
+- [Signposting](https://zenodo.org/doi/10.5281/zenodo.12554415) has been integrated in a record's API responses and using the `Accept: application/linkset+json` header for a `/api/records/<record_id>` call returns the Linkset.
 - [Optional metadata fields](../../reference/metadata/optional_metadata.md) that are easy to enable
 - Improvements to the `invenio rdm rebuild-all-indices` command
 - Mathematical formulas in a deposit can be rendered on the landing page via