Update torch.arange doc. (#99963)

To always exclude `end` without being affected by rounding error, `epsilon` should be subtracted, instead of being added.

Fixes #99853

Pull Request resolved: #99963
Approved by: https://github.com/kit1980

torch/_torch_docs.py

@@ -9357,7 +9357,7 @@ def merge_dicts(*dicts):
 :attr:`step` beginning from `start`.
 
 Note that non-integer :attr:`step` is subject to floating point rounding errors when
-comparing against :attr:`end`; to avoid inconsistency, we advise adding a small epsilon to :attr:`end`
+comparing against :attr:`end`; to avoid inconsistency, we advise subtracting a small epsilon from :attr:`end`
 in such cases.
 
 .. math::