Fix documentation.

Original Pull Request #1786
Closes #1785

(cherry picked from commit 8b7f0f8327)

src/main/asciidoc/reference/elasticsearch-auditing.adoc

@@ -30,11 +30,15 @@ public class Person implements Persistable<Long> {
     @Id private Long id;
     private String lastName;
     private String firstName;
+    @CreatedDate
     @Field(type = FieldType.Date, format = DateFormat.basic_date_time)
     private Instant createdDate;
+    @CreatedBy
     private String createdBy
     @Field(type = FieldType.Date, format = DateFormat.basic_date_time)
+    @LastModifiedDate
     private Instant lastModifiedDate;
+    @LastModifiedBy
     private String lastModifiedBy;
 
     public Long getId() {                                                 // <.>