correct value argument name for Tensor.index_fill_ docs (#51763)
Summary:
The name of "val" is inconsistent with the rest of the API and also
inconsistent with the underlying C++ implementation.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/51763
Test Plan:
Used the following command to demonstrate incorrect docs before and
correct docs after:
python -c 'import torch; print(torch.Tensor.index_fill_.__doc__)'
Fixes https://github.com/pytorch/pytorch/issues/51250
Reviewed By: zhangguanheng66
Differential Revision: D26271273
Pulled By: dagitses
fbshipit-source-id: 4897da80b639c54ca652d2111e13f26efe2646a0
