Repeat: Fix javadoc to say 'annotation' instead of 'interface'

Change-Id: Ib0c4ec28d6b7e2fc0fe71f7dc53dd12ccd6e8a2f
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/Repeat.java

@@ -47,7 +47,7 @@ import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
 /**
- * Interface enabling to run tests repeatedly
+ * Annotation enabling to run tests repeatedly
  */
 @Retention(RetentionPolicy.RUNTIME)
 @Target({ java.lang.annotation.ElementType.METHOD })