[test] Make environment variable name better (#97356)
This PR intends to use better (or correct?) environment variable name (`TORCH_DOCTEST_ANOMALY` instead of `TORCH_DOCTEST_ANOMOLY`) in test.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/97356
Approved by: https://github.com/malfet, https://github.com/kit1980
