Function signatures containing structs appear as `undefined`

[0xCourtney]

I noticed that structs do not render in the docs with a description. This can be seen in the docs for set() in Bar.sol found in this repo.

### set

```solidity
function set(IBar.T t) external nonpayable

Parameters

Name	Type	Description
t	IBar.T	undefined

[mattstam]

+1 also ran into this, would be great to get that fix in.