Grammatical update of tech docs (#61547)
Summary:
Added some minor grammatical updates to the 'Complex Numbers' docs.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/61547
Reviewed By: zou3519
Differential Revision: D29677361
Pulled By: H-Huang
fbshipit-source-id: 78222310a755911192905a8f52aa0ae325900006
