[docs] `batch_isend_irecv` and `P2POp` of torch.distributed (#86438)
Reopening https://github.com/pytorch/pytorch/pull/79722
cc @mrshenli @pritamdamania87 @zhaojuanmao @satgera @rohan-varma @gqchen @aazzolini @osalpekar @jiayisuse @H-Huang @kwen2501 @awgu
Pull Request resolved: https://github.com/pytorch/pytorch/pull/86438
Approved by: https://github.com/kit1980
