Fix '@since' tags of relocated code

spring-boot-project/spring-boot-session/src/main/java/org/springframework/boot/session/endpoint/ReactiveSessionsEndpoint.java

@@ -34,7 +34,7 @@ import org.springframework.util.Assert;
  *
  * @author Vedran Pavic
  * @author Moritz Halbritter
- * @since 3.3.0
+ * @since 4.0.0
  */
 @Endpoint(id = "sessions")
 public class ReactiveSessionsEndpoint {

spring-boot-project/spring-boot-session/src/main/java/org/springframework/boot/session/endpoint/SessionsDescriptor.java

@@ -28,7 +28,7 @@ import org.springframework.session.Session;
  * Description of user's {@link Session sessions}.
  *
  * @author Moritz Halbritter
- * @since 3.3.0
+ * @since 4.0.0
  */
 public final class SessionsDescriptor implements OperationResponseBody {
 

spring-boot-project/spring-boot-session/src/main/java/org/springframework/boot/session/endpoint/SessionsEndpoint.java

@@ -33,7 +33,7 @@ import org.springframework.util.Assert;
  * Servlet stack.
  *
  * @author Vedran Pavic
- * @since 2.0.0
+ * @since 4.0.0
  */
 @Endpoint(id = "sessions")
 public class SessionsEndpoint {
@@ -46,7 +46,6 @@ public class SessionsEndpoint {
 	 * Create a new {@link SessionsEndpoint} instance.
 	 * @param sessionRepository the session repository
 	 * @param indexedSessionRepository the indexed session repository
-	 * @since 3.3.0
 	 */
 	public SessionsEndpoint(SessionRepository<? extends Session> sessionRepository,
 			FindByIndexNameSessionRepository<? extends Session> indexedSessionRepository) {