Remove outdated groovy-bean-definition-dsl id in whats-new

Issue: SPR-15153

Author: jhoeller

src/asciidoc/whats-new.adoc

@@ -19,7 +19,6 @@ is available on the {wiki-spring-framework}[Spring Framework GitHub Wiki].
 
 
 
-
 === Improved Getting Started Experience
 The new https://spring.io[spring.io] website provides a whole series of
 https://spring.io/guides["Getting Started"] guides to help you learn Spring. You
@@ -33,7 +32,6 @@ Framework release.
 
 
 
-
 === Removed Deprecated Packages and Methods
 All deprecated packages, and many deprecated classes and methods have been removed with
 version 4.0. If you are upgrading from a previous release of Spring, you should ensure
@@ -52,7 +50,6 @@ retained for the time being where Spring 3.2 had it; now just in deprecated form
 
 
 
-
 === Java 8 (as well as 6 and 7)
 Spring Framework 4.0 provides support for several Java 8 features. You can make use of
 __lambda expressions__ and __method references__ with Spring's callback interfaces. There
@@ -68,7 +65,6 @@ based on Spring 4, we recommend the use of Java 7 or 8.
 
 
 
-
 === Java EE 6 and 7
 Java EE version 6 or above is now considered the baseline for Spring Framework 4, with
 the JPA 2.0 and Servlet 3.0 specifications being of particular relevance. In order to
@@ -96,7 +92,6 @@ Spring Framework 4.0. The same applies to Hibernate Validator 5.0 as a Bean Vali
 
 
 
-[[groovy-bean-definition-dsl]]
 === Groovy Bean Definition DSL
 Beginning with Spring Framework 4.0, it is possible to define external bean configuration
 using a Groovy DSL. This is similar in concept to using XML bean definitions but allows
@@ -131,7 +126,6 @@ For more information consult the `GroovyBeanDefinitionReader`
 
 
 
-
 === Core Container Improvements
 There have been several general improvements to the core container:
 
@@ -159,7 +153,6 @@ There have been several general improvements to the core container:
 
 
 
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 === General Web Improvements
 Deployment to Servlet 2.5 servers remains an option, but Spring Framework 4.0 is now
 focused primarily on Servlet 3.0+ environments. If you are using the
@@ -179,7 +172,6 @@ have been made to Spring's Web modules:
 
 
 
-
 === WebSocket, SockJS, and STOMP Messaging
 A new `spring-websocket` module provides comprehensive support for WebSocket-based,
 two-way communication between client and server in web applications. It is compatible with
@@ -201,7 +193,6 @@ For further details, including a more thorough introduction, see the <<websocket
 
 
 
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 === Testing Improvements
 In addition to pruning of deprecated code within the `spring-test` module, Spring
 Framework 4.0 introduces several new features for use in unit and integration testing.
@@ -389,6 +380,7 @@ method has been added.
 
 
 
+
 [[new-in-4.2]]
 == New Features and Enhancements in Spring Framework 4.2
 
@@ -624,6 +616,7 @@ public @interface MyTestConfig {
 
 
 
+
 [[new-in-4.3]]
 == New Features and Enhancements in Spring Framework 4.3