Miscellaneous broken RSTs fixed (#16033)
Summary:
https://pytorch.org/docs/master/tensors.html#torch.Tensor.bernoulli_
https://pytorch.org/docs/master/torch.html#torch.addmm
https://pytorch.org/docs/master/distributed_deprecated.html#torch.distributed.deprecated.reduce_multigpu
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16033
Differential Revision: D13671202
Pulled By: soumith
fbshipit-source-id: 276e10e610affe205376573e7f0f9894695d218d
