Allow intra-docs-links to jump to current crate code

[Daanoz]

Currently, when clicking a intra doc link, it opens a browser linking to docs.rs crate page.

When working on a crate which is (not yet / never) publicly published, these links don't work. As a developer I would actually rather jump to the actual code of the mentioned type if it's in my current crate similar as the bottom Go to ExampleType. Alternatively, also list OtherType in the bottom items next to Go to ExampleType.