Extract JUnit 4 into its own package in the Dependency Diagram

Author: sbrannen

documentation/src/docs/asciidoc/user-guide/appendix.adoc

@@ -149,7 +149,6 @@ package org.junit.jupiter {
 
 package org.junit.vintage {
     [junit-vintage-engine] as vintage_engine
-    [junit:junit] as junit4
 }
 
 package org.junit.platform {
@@ -167,6 +166,10 @@ package org.junit.platform {
     [junit-platform-testkit] as testkit
 }
 
+package "JUnit 4" {
+    [junit:junit] as junit4
+}
+
 package org.opentest4j {
     [opentest4j]
 }