GH-2128: Update nack() Javadoc (#3642)

- Correct the Javadoc to specify `pollTimeout` instead of `maxPollInterval` for the `nack()` methods.

Fixes: #2128 

Issue: #2128

spring-kafka/src/main/java/org/springframework/kafka/support/Acknowledgment.java

@@ -46,7 +46,7 @@ public interface Acknowledgment {
 	 * Must be called on the consumer thread.
 	 * <p>
 	 * @param sleep the duration to sleep; the actual sleep time will be larger of this value
-	 * and the container's {@code maxPollInterval}, which defaults to 5 seconds.
+	 * and the container's {@code pollTimeout}, which defaults to 5 seconds.
 	 * @since 2.8.7
 	 */
 	default void nack(Duration sleep) {
@@ -74,7 +74,7 @@ default void acknowledge(int index) {
 	 * <p>
 	 * @param index the index of the failed record in the batch.
 	 * @param sleep the duration to sleep; the actual sleep time will be larger of this value
-	 * and the container's {@code maxPollInterval}, which defaults to 5 seconds.
+	 * and the container's {@code pollTimeout}, which defaults to 5 seconds.
 	 * @since 2.8.7
 	 */
 	default void nack(int index, Duration sleep) {