Select menu docs missing overlayTheme option

[globalmatt]

http://jquerymobile.com/test/docs/forms/selects/options.html

Missing a description of the overlayTheme option:

$('select').selectmenu({ overlayTheme: "x" });

[toddparker]

BTW Matt - you can edit the docs here is GitHub to make a pull request if that's easy for you.