Add @deprecated Javadocs

spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/feign/FeignClient.java

@@ -47,6 +47,8 @@ public @interface FeignClient {
 	/**
 	 * The serviceId with optional protocol prefix. Synonym for {@link #value() value}.
 	 * Either serviceId or url must be specified but not both.
+	 *
+	 * @deprecated use {@link #name() name} instead
 	 */
 	@Deprecated
 	String serviceId() default "";