Auto merge of #4627 - integer32llc:document-libs-and-bins, r=matklad

Document the lib if a lib and bin have the same name

Fixes #4341, as discussed in that issue.

- Removes the check that bailed if there was a  bin and lib with the
  same name
- Exclude bins with the same name as libs from the proposed targets to
  build when compiling docs
- Adjust tests to expect this behavior