Update 5.0.0.md release notes for federation improvements

Author: aschwarte10

site/content/release-notes/5.0.0.md

@@ -9,6 +9,7 @@ RDF4J 5.0.0 is a major release of the Eclipse RDF4J framework. Some highlights:
 - Improved SHACL validation with support for sh:closed and pairwise validation
 - Upgrade of MapDB
   - More queries with intermediary results are no longer limited by RAM/java heap but disk space available
+- Improve performance, query throughput and correctness in a transparent federation by refining various evaluation strategies (bind joins, property paths, limit pushing, ...)
 - JSON-LD 1.1 support
 - Merge joins as an optimization
 For a complete overview, see [all issues fixed in 5.0.0](https://github.com/eclipse/rdf4j/milestone/80?closed=1).