Add "API for accessing outer test instances"

Author: sormuras

documentation/src/docs/asciidoc/release-notes/release-notes-5.4.0-M1.adoc

@@ -6,9 +6,9 @@
 *Scope:* XML report generating listener, Test Kit for testing engines and extensions, new
 `junit-jupiter` dependency aggregating artifact for simplified dependency management in
 build tools, `TempDirectory` extension, display name generator API, test execution order
-API, JUnit 4 `@Ignore` migration support, improved diagnostics and error reporting,
-discontinuation of the `junit-platform-surefire-provider`, as well as various minor
-improvements and bug fixes.
+API, API for accessing outer test instances, JUnit 4 `@Ignore` migration support, improved
+diagnostics and error reporting, discontinuation of the `junit-platform-surefire-provider`,
+as well as various minor improvements and bug fixes.
 
 For a complete list of all _closed_ issues and pull requests for this release, consult
 the link:{junit5-repo}+/milestone/29?closed=1+[5.4.0-M1] milestone page in the JUnit