FileUtils: give a hint how to delete temp dirs

This very same class has a handy method for achieving
the "caller's responsibility", so let's advertise it.

Author: ctrueden

src/main/java/org/scijava/util/FileUtils.java

@@ -407,7 +407,7 @@ public static String limitPath(final String path, final int limit) {
 	 * </p>
 	 * <p>
 	 * It is the caller's responsibility to make sure that the directory is
-	 * deleted.
+	 * deleted; see {@link #deleteRecursively(File)}.
 	 * </p>
 	 * 
 	 * @param prefix The prefix string to be used in generating the file's name;
@@ -433,7 +433,7 @@ public static File createTemporaryDirectory(final String prefix,
 	 * </p>
 	 * <p>
 	 * It is the caller's responsibility to make sure that the directory is
-	 * deleted.
+	 * deleted; see {@link #deleteRecursively(File)}.
 	 * </p>
 	 * 
 	 * @param prefix The prefix string to be used in generating the file's name;