update comment

Author: Scottmitch

servicetalk-concurrent-api/src/main/java/io/servicetalk/concurrent/api/PublisherAsBlockingIterable.java

@@ -579,7 +579,8 @@ private T take0(BiLongFunction<TimeUnit, T> taker, long timeout, TimeUnit unit)
                     }
                 } else {
                     final ThreadStamp nextStamp2;
-                    // Count should be > 0, but check <=1 for best effort recovery in case SPSC isn't honored.
+                    // Count maybe == 0 if a previous consumer already consumed data before PRODUCER updated the
+                    // threadStamp (done after insertion) and this consumer also doesn't see the PRODUCER state yet.
                     if (currStamp.count <= 1) {
                         nextStamp2 = null;
                     } else {