fix docs error in Autograd Mechanics

Fixes pytorch#74682

Pull Request resolved: pytorch#74807
Approved by: https://github.com/albanD

Author: bhbbbbb

docs/source/notes/autograd.rst

@@ -222,7 +222,7 @@ Evaluation Mode (``nn.Module.eval()``)
 Evaluation mode is not actually a mechanism to locally disable gradient computation.
 It is included here anyway because it is sometimes confused to be such a mechanism.
 
-Functionally, ``module.eval()`` (or equivalently ``module.train()``) are completely
+Functionally, ``module.eval()`` (or equivalently ``module.train(False)``) are completely
 orthogonal to no-grad mode and inference mode. How ``model.eval()`` affects
 your model depends entirely on the specific modules used in your model and
 whether they define any training-mode specific behavior.