Incorrect documentation for shortDate referencing time.

[StephenLongville]

I've been trying to use shortDate with time, but the documentation appears to be misleading.

https://mottie.github.io/tablesorter/docs/#parsers

It states the format can be followed by a time, however not only are there no examples, but if you do include a time format, the sort just doesn't work. When debugging it appears that the time aspect is not accounted for at all within the regex tests.

Custom parser is the way to go, however the docs need updating.