pytorch

51974967 - Add a private API banner (#93996)

Add a private API banner (#93996) Add a banner that will appear on all pages where the last segment of the URL starts with an underscore "_". Example pages: * https://pytorch.org/docs/master/_dynamo.html * https://pytorch.org/docs/master/_modules/torch/_jit_internal.html Sample screenshots: <img width="885" alt="Screenshot 2023-02-03 at 1 13 47 PM" src="https://user-images.githubusercontent.com/5317992/216711948-6ba35d38-da8f-4145-9580-bafc921a1df5.png"> <img width="871" alt="Screenshot 2023-02-03 at 1 12 51 PM" src="https://user-images.githubusercontent.com/5317992/216711951-877a760e-3449-4593-b81c-14bf3b9943da.png"> Pull Request resolved: https://github.com/pytorch/pytorch/pull/93996 Approved by: https://github.com/malfet, https://github.com/albanD