Enable feature(doc_auto_cfg) and --generate-link-to-definition

[Kijewski]

No description provided.

[GuillaumeGomez]

That makes me happy to see projects using features I wrote. :D

[Kijewski]

Hehe, I didn't even realize this these features were your work.

Comments may be helpful, but code is always helpful, so easily traversing it is very useful to me. And as much as you try to keep doc(cfg()) annotations up to date, chances are you won't, so I like doc_auto_cfg very much. :)

[GuillaumeGomez]

doc_auto_cfg and doc_cfg in general might get stabilized in a not so far future. The RFC is here.