updates to the release notes

Author: hmottestad

site/content/release-notes/5.0.0.md

@@ -11,13 +11,15 @@ RDF4J 5.0.0 is a major release of the Eclipse RDF4J framework. Some highlights:
   - 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
+- Implementation of merge join for future use in query evaluation
+- Stability and performance improvements to the LmdbStore
+- Improved spilling to disk for large transactions
+
 For a complete overview, see [all issues fixed in 5.0.0](https://github.com/eclipse/rdf4j/milestone/80?closed=1).
 
 ## Upgrade notes
 
-RDF4J 5.0.0 contains several [backward incompatible
-changes](https://github.com/eclipse/rdf4j/issues?q=is%3Aclosed+is%3Aissue+label%3A%22%E2%9B%94+Not+backwards+compatible%22+milestone%3A%225.0.0%22), including removal of several deprecated modules and classes.
+RDF4J 5.0.0 contains several [backward incompatible changes](https://github.com/eclipse/rdf4j/issues?q=is%3Aclosed+is%3Aissue+label%3A%22%E2%9B%94+Not+backwards+compatible%22+milestone%3A%225.0.0%22), including removal of several deprecated modules and classes.
 
 ### Configuration vocabulary upgrade