[CUDA] Fix typo in Normalization.cu (#62515)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/62515
**Summary**
This commit fixes an obvious typo in `Normalization.cu` I found while
working on #62452. Since that PR will not be landed anytime soon, I
thought it would be prudent to land this fix.
**Test Plan**
Continuous integration.
Test Plan: Imported from OSS
Reviewed By: makslevental
Differential Revision: D30027324
Pulled By: SplitInfinity
fbshipit-source-id: 9d368a54c13f8e2bf6f6956dfb2bee974226f726
