fix assert_close docstring (#89620)
Two improvements here:
1. To render a bullet list correctly, a blank line before and after is needed. Compare
vs.
2. #72508 added proper support for meta tensors. Thus, we no longer throw an error if we encounter them.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/89620
Approved by: https://github.com/kit1980
