Move #4153 to 5.11.4 release notes

(cherry picked from commit d7e765c)

Author: marcphilipp

documentation/src/docs/asciidoc/release-notes/release-notes-5.11.4.adoc

@@ -20,6 +20,8 @@ JUnit repository on GitHub.
   exception messages) in the legacy XML report generated by the Console Launcher. This
   change ensures the resulting XML files can be processed by downstream tools while
   preserving whitespace characters.
+* Enable auto-flushing of output in the `ConsoleLauncher` to fix issues with buffering,
+  in particular when using the `--details=testfeed` option.
 
 [[release-notes-5.11.4-junit-platform-deprecations-and-breaking-changes]]
 ==== Deprecations and Breaking Changes