Resolution bug for sections

[dbuenzli]

There seem to be a resolution bug for sections on master:

Consider:

https://b0-system.github.io/odig/doc/brr/Brr/El/index.html#el_lookups

.mli source

In this section the first reference gets linked on Brr/index.html instead of Brr/Document/index.html. Note that the references to the value Document.root just below are correctly linked.

[jonludlam]

Thanks @dbuenzli - we'll take a look.