respect `@throw(s)` tags

I know it's too old and it need some bumps soon, but just to point it. :)

I believe I will come to @docksjs soon (in week or two), which would be great for such things using plugins. :)

for example that's the code for get source code of a comment - [test.js#L63-L74](https://github.com/docksjs/docks/blob/master/test.js#L63-L74), and above that is the doctrine plugin.
