Update Test.java

Fixed a grammatically incorrect comment.

Author: Jonathan Beaudoin

src/main/java/org/junit/Test.java

@@ -66,7 +66,7 @@
 public @interface Test {
 
     /**
-     * Default empty exception
+     * Default empty exception.
      */
     static class None extends Throwable {
         private static final long serialVersionUID = 1L;