GH-5723: Apply suggestions from code review

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: aschwarte10

site/content/release-notes/6.0.0-M1.md

@@ -15,15 +15,15 @@ Some of the highlights covered in this first milestone:
 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.
 
 - [issues fixed in 6.0.0 Milestone 1](https://github.com/eclipse-rdf4j/rdf4j/issues?q=is%3Aissue+label%3AM1+is%3Aclosed+milestone%3A6.0.0)
-- [issues planned for 6.0.0](https://github.com/eclipse-rdf4j/rdf4j/milestone/TODO)
+- issues planned for 6.0.0
 
 # Upgrade notes
 
 RDF4J 6.0.0 contains several [backward incompatible changes](https://github.com/eclipse-rdf4j/rdf4j/issues?q=is%3Aclosed+is%3Aissue+label%3A%22%E2%9B%94+Not+backwards+compatible%22+milestone%3A6.0.0).
 
 ## HTTP client migration (Apache HttpComponents 4 removed)
 
-RDF4J previously used Apache HttpComponents 4 (AHC4) as its sole HTTP client, with AHC4 types directly exposed in the public API. In 6.0.0, this dependency has been replaced by a new HTTP-client-agnostic facade. Apache HC4 is no longer on the classpath for the general use of RDF4J.
+RDF4J previously used Apache HttpComponents 4 (AHC4) as its sole HTTP client, with AHC4 types directly exposed in the public API. In 6.0.0, this dependency has been replaced by a new HTTP-client-agnostic facade. Apache HC4 is no longer exposed through the `rdf4j-http-client` public API or required as a transitive dependency of `rdf4j-http-client` for standard use.
 
 ### User-facing changes
 
@@ -32,7 +32,7 @@ RDF4J previously used Apache HttpComponents 4 (AHC4) as its sole HTTP client, wi
 Two HTTP client backends are now available:
 
 - **Apache HttpComponents 5** (`rdf4j-http-client-apache5`) — the default backend when on the classpath.
-- **JDK built-in HTTP client** (`rdf4j-http-client-jdk`) — a zero-dependency alternative using `java.net.http.HttpClient` (JDK 11+).
+- **JDK built-in HTTP client** (`rdf4j-http-client-jdk`) — a zero-dependency alternative using the JDK 11+ `java.net.http.HttpClient` API; RDF4J 6.0.0 itself requires Java 25.
 
 To select a specific backend, set the system property `rdf4j.http.client.factory` to either `apache5` or `jdk`:
 
@@ -136,7 +136,3 @@ public class MyFactory extends ApacheHC5RDF4JHttpClientFactory {
     }
 }
 ```
-
-## Acknowledgements
-
-This milestone was made possible by contributions from ...