util.format doc inconsistent from markdown

[mikechun]

placeholder information under util.format(format, [...]) on nodejs.org website API doc has
% - single percent sign
(http://nodejs.org/api/util.html#util_util_format_format)

Please fix it to match the correct information as shown in the node API markdown.
%% - single percent sign
(https://github.com/joyent/node/blob/master/doc/api/util.markdown)

[ThisIsMissEm]

This seems to be a bug in the markdown output, but I'll take a look into it.