remove superfluous/duplice section

Author: rpietzsch

docs/release-notes/corporate-memory-25-2/index.md

@@ -95,11 +95,7 @@ We are excited to announce the release of DataIntegration v25.2.2, which introdu
 
 ## eccenca Explore v25.2.6
 
-We are pleased to announce Explore v25.2.5, which brings significant enhancements to SHACL shape management, improved graph handling, and a modernized knowledge graph exploration experience.
-
-**v25.2.5 of Explore ships the following fix:**
-
--   Anonymous classes are not considered when resolving the `rdfs:subClassOf` based class hierarchy
+We are pleased to announce Explore v25.2.6, which brings significant enhancements to SHACL shape management, improved graph handling, and a modernized knowledge graph exploration experience.
 
 **v25.2.6 of Explore ships the following fix:**