Default @Retryable has 1s blocking back-off despite docs saying otherwise

[AriApar]

The docs for retryable annotation state that default behaviour is no backoff:

       /**
	 * Specify the backoff properties for retrying this operation. The default is no
	 * backoff, but it can be a good idea to pause between attempts (even at the cost of
	 * blocking a thread).
	 * @return a backoff specification
	 */
	Backoff backoff() default @Backoff();

but a default @Backoff annotation would have a backoff of 1s as mentioned in:

/**
 * Collects metadata for a {@link BackOffPolicy}. Features:
 *
 * <ul>
 * <li>With no explicit settings the default is a fixed delay of 1000ms</li>
 * ...
 */
public @interface Backoff {

	/**
	 * Synonym for {@link #delay()}.
	 *
	 * @return the delay in milliseconds (default 1000)
	 */
	long value() default 1000;

and used by https://github.com/spring-projects/spring-retry/blob/master/src/main/java/org/springframework/retry/annotation/AnnotationAwareRetryOperationsInterceptor.java#L319

[dsyer]

I reverted #88 because there is a failing test for me. Not sure why yet.

[dsyer]

Re-opened in case we actually want to change the default.