[DOCS]Correct docs for torch.lu_solve (#47762)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/43498 by correcting the function signature of `torch.lu_solve`
Pull Request resolved: https://github.com/pytorch/pytorch/pull/47762
Reviewed By: ljk53
Differential Revision: D24900259
Pulled By: ailzhang
fbshipit-source-id: 2a43170bde57e03d44025b23e3abcda169cfc9e2
