SONARJAVA-4473 Update exception for S2384 to correspond to update in implementation

rules/S2384/java/rule.adoc

@@ -12,22 +12,25 @@ This rule checks that private arrays, collections and Dates are not stored or re
 
 The rule violation is not reported for mutable values stored in private methods if no non-private methods directly passes a mutable parameter to them.
 
+Similarly, the rule violation is not reported for mutable values returned by a private getter, when the getter's value is not returned directly by a non-proviate method.
+
+
 === Noncompliant code example
 
 [source,java]
 ----
 class A {
-  private String [] strings;
+  private String[] strings;
 
   public A () {
     strings = new String[]{"first", "second"};
   }
 
-  public String [] getStrings() {
+  public String[] getStrings() {
     return strings; // Noncompliant
   }
 
-  public void setStrings(String [] strings) {
+  public void setStrings(String[] strings) {
     this.strings = strings;  // Noncompliant
   }
 }
@@ -54,15 +57,19 @@ class A {
     strings = new String[]{"first", "second"};
   }
 
-  public String [] getStrings() {
-    return strings.clone();
+  public String[] getStrings() {
+    return getStringsInternal().clone();
+  }
+
+  private String[] getStringsInternal() {
+    return strings;
   }
 
-  private void setStringsInternal(String [] strings) {
+  private void setStringsInternal(String[] strings) {
     this.strings = strings;
   }
 
-  public void setStrings(String [] strings) {
+  public void setStrings(String[] strings) {
     this.strings = strings.clone();
   }
 }