Infer documentation and name from rustdoc

[slinkydeveloper]

Hi, I was wondering if it's possible for a path to infer its documentation and summary from its rustdoc, in a similar fashion to how schemars does it: https://graham.cool/schemars/examples/6-doc_comments/

[Flowneee]

This even listed as TODO somewhere. It's actually should not be very hard to do, only problem I remember in schemars is that it handles complex markup incorrectly. For example first paragraph of documentation could be summary and the rest is documentation, unless it is not overridden by attribute.