update news item

Author: hmottestad

site/content/news/rdf4j-600-M1.md

@@ -6,7 +6,9 @@ categories: ["news"]
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 Milestone number 1 of the upcoming 6.0.0 release of RDF4J is now available for download.
 
-RDF4J 6.0.0 is a minor release focusing on ... .
+RDF4J 6.0.0 is a major release focusing on dependency upgrades, lmdb improvements and http client improvements.
+
+Please note that RDF4J 6.0.0-M1 requires Java 25.
 
 This milestone build is not yet feature-complete, but we are putting it out to receive early feedback on all the improvements we have put in.