Solved by jpeg729 in post #2 
              
              
                torch.nn.Conv2d is just a reference to torch.nn.modules.conv.Conv2d. To understand that here are the details from the source code. 
torch.nn module imports * from .modules 
torch.nn.modules imports Conv2d from .conv 
Therefore the docs for torch.nn.Conv2d are the ones you are looking for.