[caffe2] fix wrong comment (#42735)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/42735
We use reduced precision only for embedding table (not for momentum) in RowWiseSparseAdagrad
Test Plan: .
Reviewed By: jianyuh
Differential Revision: D23003939
fbshipit-source-id: 062290d94b160100bc4c2f48b797833819f8e88a
