Removed outdated references to Servlet 2.3/2.4

(cherry picked from commit 673dac5)

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/support/OpenSessionInViewFilter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2015 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -38,7 +38,7 @@ import org.springframework.web.context.support.WebApplicationContextUtils;
 import org.springframework.web.filter.OncePerRequestFilter;
 
 /**
- * Servlet 2.3 Filter that binds a Hibernate Session to the thread for the entire
+ * Servlet Filter that binds a Hibernate Session to the thread for the entire
  * processing of the request. Intended for the "Open Session in View" pattern,
  * i.e. to allow for lazy loading in web views despite the original transactions
  * already being completed.
@@ -98,6 +98,7 @@ public class OpenSessionInViewFilter extends OncePerRequestFilter {
 		return this.sessionFactoryBeanName;
 	}
 
+
 	/**
 	 * Returns "false" so that the filter may re-bind the opened Hibernate
 	 * {@code Session} to each asynchronously dispatched thread and postpone