KAFKA-8208: Change paper link directly to ASM (#6572)

Reviewers: Matthias J. Sax <mjsax@apache.org>, Victoria Bialas <vicky@confluent.io>

docs/streams/core-concepts.html

@@ -224,7 +224,7 @@
 
     <p>
         Besides the guarantee that each record will be processed exactly-once, another issue that many stream processing application will face is how to
-        handle <a href="https://www.confluent.io/wp-content/uploads/streams-tables-two-sides-same-coin.pdf">out-of-order data</a> that may impact their business logic. In Kafka Streams, there are two causes that could potentially
+        handle <a href="https://dl.acm.org/citation.cfm?id=3242155">out-of-order data</a> that may impact their business logic. In Kafka Streams, there are two causes that could potentially
         result in out-of-order data arrivals with respect to their timestamps:
     </p>