programs/xcopy: fix a typo in a comment

[Hugh McMaster]

On Saturday, 30 November 2013 4:28 pm, Austin English wrote:
>  /* Microsoft's xcopy's usage implies that the date
>- * format depends on the locale but that false.
>+ * format depends on the locale but that is false.
>  * It is hardcoded to month-day-year
>  */

Hi Austin,

It would be a good idea to fix the first line of the comment as well.

Something like: "Usage of Microsoft's xcopy implies that the date"

Hugh