Module/submodule procedure's description not showing in FORD's Procedures webpage Description field about ford HOT 1 OPEN

I think there's two separate issues here:

1. the interface's description doesn't appear in the list of procedures, this seems to only be true for module procedures
2. if display: private is set (either at the project level, or in the submodule), then links between the module procedure's interface and its implementation are created:

The first issue is a bug -- I also think it would be better to have it appear as "module procedure" rather than "interface". I'll look into it.

The second one is a consequence of entities in submodules being private by default, and this applies to implementations of module procedures as well. I think this is sensible as submodules are designed to hide implementation details, so only the documentation for the public interface should be shown by default. If you want to have extra developer-only documentation on the implementation, you could enable that with display: private -- making this easier to document public vs private and user vs developer APIs was also raised in #473

from ford.