Update derivatives.yaml docs to refer to Declarations.yaml rather than Declarations.cwrap. (#25357)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25357
Declarations.cwrap is no longer hooked up derivatives.yaml directly.
Test Plan: Imported from OSS
Differential Revision: D17101570
Pulled By: gchanan
fbshipit-source-id: 838ea6a89c7403e73676292b93d864ecfdd6251b
