Added more realistic example config, fixed typo

Hey,

Great plugin! I hate pushing to gh-pages manually.

I thought it would be cool to have a more realistic example config as I doubt anyone has their source files on the same level as their Gruntfile.

I also found a syntax error using a tool I made called [mdlint](https://github.com/ChrisWren/mdlint) which lints JavaScript code blocks in markdown files.

Thanks for making this plugin!