Fix Streams doc ref link
Reviewers: Guozhang Wang
<li><a class="reference internal" href="#testing-a-streams-app" id="id3">Testing a Streams application</a></li>
</ul>
<p>Any Java application that makes use of the Kafka Streams library is considered a Kafka Streams application.
- The computational logic of a Kafka Streams application is defined as a <a class="reference internal" href="../concepts.html#streams-concepts"><span class="std std-ref">processor topology</span></a>,
+ The computational logic of a Kafka Streams application is defined as a <a class="reference internal" href="../core-concepts#streams_topology"><span class="std std-ref">processor topology</span></a>,
which is a graph of stream processors (nodes) and streams (edges).</p>
<p>You can define the processor topology with the Kafka Streams APIs:</p>
<dl class="docutils">
