Change comments for examples_star_json build target

@gingerik, what do you think?
The doc says

> if they are specified as input files through the "src" property, then closure-util will
> exclude them when creating the dependencies graph.

When path patterns are provided in the `src`, our `build.js` task **includes** them [as `lib` files for `closure-util`](https://github.com/openlayers/ol3/blob/dc0ff2eee8eabb94e6bbf8a325430eb9c946d688/tasks/build.js#L123-L141).  All `lib` files are considered (or you could say **included**) in resolving dependencies.

If you provide paths to the `compile.js` config, these paths are **not** passed to `closure-util` (here you might say that paths are **excluded** from the dependency resolution work that `closure-util` does).

The dependencies resolved based on `src` files [are concatenated together](https://github.com/openlayers/ol3/blob/dc0ff2eee8eabb94e6bbf8a325430eb9c946d688/tasks/build.js#L183-L185) with any `compile.js` paths before being passed to the compiler.

So yes, your comment sounds incorrect to me (including `src` paths does not have to do with **excluding** anything).  Maybe I don't get what you mean by exclude.