Fix typo.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@1454712 13f79535-47bb-0310-9956-ffa450edef68

src/test/java/org/apache/commons/collections/BulkTest.java

@@ -294,9 +294,9 @@ class BulkTestSuiteMaker {
     }
 
     /**
-     *  Makes a hierarchal TestSuite based on the starting class.
+     *  Makes a hierarchical TestSuite based on the starting class.
      *
-     *  @return  the hierarchal TestSuite for startingClass
+     *  @return  the hierarchical TestSuite for startingClass
      */
     public TestSuite make() {
          this.result = new TestSuite();