fix batch_isend_irecv example incorrect usage

[H-Huang]

Stack from ghstack (oldest at bottom):

• -> fix batch_isend_irecv example incorrect usage #110408

mismatched dtypes silently leads to wrong outputs in nccl

1:recv_tensor=tensor([0., 0.], device='cuda:1')
0:recv_tensor=tensor([2.8026e-45, 0.0000e+00], device='cuda:0')

[pytorch-bot]

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[H-Huang]

@pytorchbot merge

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