Polishing.

Add missing deprecations.

See #2483

Author: mp911de

spring-data-rest-webmvc/src/main/java/org/springframework/data/rest/webmvc/json/JacksonMetadata.java

@@ -46,6 +46,7 @@
  * @author Oliver Gierke
  * @author Greg Turnquist
  */
+@Deprecated(since = "5.0", forRemoval = true)
 public class JacksonMetadata implements Iterable<BeanPropertyDefinition> {
 
 	private final ObjectMapper mapper;

spring-data-rest-webmvc/src/main/java/org/springframework/data/rest/webmvc/json/PersistentEntityToJsonSchemaConverter.java

@@ -286,7 +286,7 @@ private class JsonSchemaPropertyRegistrar {
 		private final List<AbstractJsonSchemaProperty<?>> properties;
 
 		/**
-		 * Creates a new {@link JsonSchemaPropertyRegistrar} using the given {@link JacksonMetadata}.
+		 * Creates a new {@link JsonSchemaPropertyRegistrar} using the given {@link Jackson3Metadata}.
 		 *
 		 * @param metadata must not be {@literal null}.
 		 */