Rollup merge of #65857 - kinnison:kinnison/issue-55364, r=Manisheart,GuillaumeGomez

Rollup merge of #65857 - kinnison:kinnison/issue-55364, r=Manisheart,GuillaumeGomez

rustdoc: Resolve module-level doc references more locally

Module level docs should resolve intra-doc links as locally as
possible.  As such, this commit alters the heuristic for finding
intra-doc links such that we attempt to resolve names mentioned
in *inner* documentation comments within the (sub-)module rather
that from the context of its parent.

I'm hoping that this fixes #55364 though right now I'm not sure it's the right fix.

r? @GuillaumeGomez