Clean a GitHub 404 in queries.jade

A couple links in the [queries.html](http://mongoosejs.com/docs/queries.html) documentation (in the yellow thingy) redirect to a GitHub 404:

This is due to an unnecessary `docs` item in the urls:

```
http://mongoosejs.com/docs/docs/api.html#model_Model.findOne -> http://mongoosejs.com/docs/api.html#model_Model.findOne
```
Merge pull request #2541 from alexjab/patch-1

Clean a GitHub 404 in queries.jade