SAMOA-34: Fix javadoc of Learner
diff --git a/samoa-api/src/main/java/org/apache/samoa/learners/Learner.java b/samoa-api/src/main/java/org/apache/samoa/learners/Learner.java
index 730f4d9..a19943e 100644
--- a/samoa-api/src/main/java/org/apache/samoa/learners/Learner.java
+++ b/samoa-api/src/main/java/org/apache/samoa/learners/Learner.java
@@ -29,8 +29,9 @@
import org.apache.samoa.topology.TopologyBuilder;
/**
- * The Interface Classifier. Initializing Classifier should initalize PI to connect the Classifier with the input stream
- * and initialize result stream so that other PI can connect to the classification result of this classifier
+ * A Learner instance learns a model, and it can be either a classifier or a regressor. Initializing a Learner should
+ * initialize a {@link Processor}, connect the Learner with the input stream, and initialize the result stream so that other processors
+ * can subscribe to the results of this learner.
*/
public interface Learner extends Serializable {
