[BUG] Errors in the API docs

[cjnolet]

Was talking with @alexanderguzhva today and he noticed that our API docs have a few places where clicking on a particular object or class type link will got to a doxygen error page, rather than a page outlining the details of the expected type. We should inventory and fix these issues.

Alex mentioned a few raft-related APIs were doing this. I'll let Alex also fill in any other APIs that he noticed off the top of his head.