Fix documentation, pointed out by Marcus. Also fix the return type when we can't transpose.
Fix documentation, pointed out by Marcus.
Also fix the return type when we can't transpose.

ajjl/mlpack,palashahuja/mlpack,BookChan/mlpack,ajjl/mlpack,Azizou/mlpack,bmswgnp/mlpack,BookChan/mlpack,bmswgnp/mlpack,chenmoshushi/mlpack,stereomatchingkiss/mlpack,datachand/mlpack,lezorich/mlpack,thirdwing/mlpack,minhpqn/mlpack,ajjl/mlpack,palashahuja/mlpack,minhpqn/mlpack,stereomatchingkiss/mlpack,Azizou/mlpack,stereomatchingkiss/mlpack,erubboli/mlpack,datachand/mlpack,chenmoshushi/mlpack,lezorich/mlpack,palashahuja/mlpack,bmswgnp/mlpack,chenmoshushi/mlpack,BookChan/mlpack,trungda/mlpack,erubboli/mlpack,theranger/mlpack,ersanliqiao/mlpack,ranjan1990/mlpack,trungda/mlpack,ranjan1990/mlpack,ranjan1990/mlpack,datachand/mlpack,ersanliqiao/mlpack,thirdwing/mlpack,ersanliqiao/mlpack,trungda/mlpack,minhpqn/mlpack,darcyliu/mlpack,darcyliu/mlpack,thirdwing/mlpack,lezorich/mlpack,Azizou/mlpack,erubboli/mlpack,theranger/mlpack,darcyliu/mlpack,theranger/mlpack