Normalize test Javadoc

The class name tells you it's a unit test as opposed to an IT test

Author: garydgregory

src/test/java/org/apache/commons/collections4/keyvalue/MultiKeyTest.java

@@ -43,7 +43,7 @@
 import org.junit.jupiter.api.TestFactory;
 
 /**
- * Unit tests for {@link org.apache.commons.collections4.keyvalue.MultiKey}.
+ * Tests for {@link org.apache.commons.collections4.keyvalue.MultiKey}.
  */
 public class MultiKeyTest {