Dialog: typo under "position"

[jzaefferer]

"botom" should be "bottom".

String: A string representing the position within the viewport. Possible values: "center", "left", "right", "top", "botom".

should be

String: A string representing the position within the viewport. Possible values: "center", "left", "right", "top", "bottom".

From http://bugs.jqueryui.com/ticket/8727