Consistent use of @deprecated since

See gh-25808

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/invoker/cache/CachingOperationInvoker.java

@@ -110,7 +110,7 @@ public class CachingOperationInvoker implements OperationInvoker {
 	 * @param timeToLive the maximum time in milliseconds that a response can be cached
 	 * @return a caching version of the invoker or the original instance if caching is not
 	 * required
-	 * @deprecated as of 2.3 to make package-private in 2.4
+	 * @deprecated since 2.3 for removal in 2.5
 	 */
 	@Deprecated
 	public static OperationInvoker apply(OperationInvoker invoker, long timeToLive) {

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/elasticsearch/rest/RestClientBuilderCustomizer.java

@@ -25,7 +25,7 @@ import org.elasticsearch.client.RestClientBuilder;
  *
  * @author Brian Clozel
  * @since 2.1.0
- * @deprecated as of 2.3.1 for removal in 2.5 in favor of
+ * @deprecated since 2.3.1 for removal in 2.5 in favor of
  * {@link org.springframework.boot.autoconfigure.elasticsearch.RestClientBuilderCustomizer}
  */
 @FunctionalInterface