Add torch.utils to the docs page, remove dead code and fix docstrings (#105142)
As per title.
Note that the c++ side code for the minidumps part was removed. So trying to call any of these 3 functions today results in an error saying that `torch._C` doesn't have these attributes.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/105142
Approved by: https://github.com/janeyx99
