Fix simple spelling mistake in documentation.
fix #5808
these objects you should use appropriate methods. For most general
uses [getTime()][MDN-Date-getTime] will return the number of
milliseconds elapsed since _1 January 1970 00:00:00 UTC_ and this
-integer should be sufficient for any comparison, however there
+integer should be sufficient for any comparison, however there are
additional methods which can be used for displaying fuzzy information.
More details can be found in the [MDN JavaScript Reference][MDN-Date]
page.