Doc improvement in LKJCholesky distribution (#91091)
Better structure & formatting. Added more info to reference.
The change can be viewed here: https://docs-preview.pytorch.org/91091/distributions.html?highlight=lkjcholesky#torch.distributions.lkj_cholesky.LKJCholesky
Pull Request resolved: https://github.com/pytorch/pytorch/pull/91091
Approved by: https://github.com/kit1980
