delete the space for the docs rendering (#44740)
Summary:
see the docs rendering of `jacobian` and `hessian` at https://pytorch.org/docs/stable/autograd.html
Pull Request resolved: https://github.com/pytorch/pytorch/pull/44740
Reviewed By: ngimel
Differential Revision: D23724899
Pulled By: mrshenli
fbshipit-source-id: f7558ff53989e5dc7e678706207be2ac7ce22c66
