Update the documentation for creating an OAuth access token
Update the documentation for creating an OAuth access token

According to the Github v3 API, the correct scope is the singular version of "repo" instead of "repos".

[More Information](http://developer.github.com/v3/oauth/#scopes)
larrylv/ghee,transistorsoft/ghee,discorick/ghee,aclevy/ghee,mooremo/ghee,rauhryan/ghee,drusellers/ghee,huboard/ghee