clarifies comments

clients/src/main/java/org/apache/kafka/clients/NetworkClientUtils.java

@@ -72,12 +72,14 @@ public static boolean awaitReady(KafkaClient client, Node node, Time time, long
             }
             long pollTimeout = timeoutMs - (attemptStartTime - startTime); // initialize in this order to avoid overflow
 
-            // If the network client is delayed for some reason (eg. throttling or retry backoff), polling longer than
-            // that is potentially dangerous as the producer will get stuck waiting with potential for some pending
-            // requests to just not get sent. This fixes KAFKA-17455. This is the way.
-            long timeUntilCanSendDataAgain = client.pollDelayMs(node, startTime);
-            if (timeUntilCanSendDataAgain > 0 && pollTimeout > timeUntilCanSendDataAgain) {
-                pollTimeout = timeUntilCanSendDataAgain;
+            // If the network client is waiting to send data for some reason (eg. throttling or retry backoff),
+            // polling longer than that is potentially dangerous as the producer will not attempt to send
+            // any pending requests.
+            long waitingTime = client.pollDelayMs(node, startTime);
+            if (waitingTime > 0 && pollTimeout > waitingTime) {
+                // Block only until the next-scheduled time that it's okay to send data to the producer,
+                // wake up, and try again. This is the way.
+                pollTimeout = waitingTime;
             }
 
             client.poll(pollTimeout, attemptStartTime);