Refer to Spring Retry project in Javadoc

spring-aop/src/main/java/org/springframework/aop/retry/annotation/Retryable.java

@@ -35,6 +35,9 @@ import org.springframework.core.annotation.AliasFor;
  * as well as Reactor's retry support, either re-invoking an imperative
  * target method or decorating a reactive result accordingly.
  *
+ * <p>Inspired by the <a href="https://github.com/spring-projects/spring-retry">Spring Retry</a>
+ * project but redesigned as a minimal core retry feature in the Spring Framework.
+ *
  * @author Juergen Hoeller
  * @since 7.0
  * @see RetryAnnotationBeanPostProcessor

spring-core/src/main/java/org/springframework/core/retry/RetryOperations.java

@@ -24,6 +24,9 @@ import org.jspecify.annotations.Nullable;
  * <p>Implemented by {@link RetryTemplate}. Not often used directly, but a useful
  * option to enhance testability, as it can easily be mocked or stubbed.
  *
+ * <p>Inspired by the <a href="https://github.com/spring-projects/spring-retry">Spring Retry</a>
+ * project but redesigned as a minimal core retry feature in the Spring Framework.
+ *
  * @author Mahmoud Ben Hassine
  * @since 7.0
  * @see RetryTemplate