Fix Javadoc in EnableWebSocketSecurity

Add missing method name in EnableWebSocketSecurity JavaDoc code example.

config/src/main/java/org/springframework/security/config/annotation/web/socket/EnableWebSocketSecurity.java

@@ -37,7 +37,7 @@ import org.springframework.context.annotation.Import;
  * public class WebSocketSecurityConfig {
  *
  * 	@Bean
- * 	AuthorizationManager<Message<?>> (MessageMatcherDelegatingAuthorizationManager.Builder messages) {
+ * 	AuthorizationManager<Message<?>> authorizationManager(MessageMatcherDelegatingAuthorizationManager.Builder messages) {
  * 		messages.simpDestMatchers("/user/queue/errors").permitAll()
  * 				.simpDestMatchers("/admin/**").hasRole("ADMIN")
  * 				.anyMessage().authenticated();