update release notes

site/content/news/rdf4j-510.md

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-RDF4J 5.1.0 is now available. This is a patch release fixing 16 bugs.
+RDF4J 5.1.0 is now available.
 
 For more details, have a look at the [release notes](/release-notes/5.1.0).
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site/content/release-notes/5.1.0.md

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 title: "5.1.0"
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-RDF4J 5.1.0 is a patch release that fixes 16 issues.
+
+RDF4J 5.1.0 is a minor release of the Eclipse RDF4J framework. Some highlights:
+
+- Stability and performance improvements in the FedX federation engine, including refinements to the bind join implementation for regular and OPTIONAL joins
+- Support for specifying the [lucene document threshold at query time](https://github.com/eclipse-rdf4j/rdf4j/issues/5149)
+- VALUES for SparqlBuilder
+- [Enable UpdateWithModelBuilder to delete triples](https://github.com/eclipse-rdf4j/rdf4j/issues/4999)
+- [HttpClient timeout and pooling options](https://github.com/eclipse-rdf4j/rdf4j/pull/5125)
+- [DOCUMENT_LOADER support for JSON-LD 1.1 parser](https://github.com/eclipse-rdf4j/rdf4j/pull/5162)
+- Upgrade to Tomcat 9 in docker image
+- Add support for Jetty 9 in docker image
+- Improve performance of SPARQLConnection#size() method
+- Adjust how SHACL validation of minCount and maxCount is handled for union graphs with duplicates
+- Support for DCAT v3
+
 
 For a complete overview, see [all issues fixed in 5.1.0](https://github.com/eclipse/rdf4j/milestone/107?closed=1).
 
 ### Acknowledgements
 
-This release was made possible by contributions from ???
+This release was made possible by contributions from Bart Hanssens, Antoine Willerval, Håvard M. Ottestad, Florian Kleedorfer, Andreas Schwarte and Jerven Bolleman.