Fix `asarray` documentation formatting (#78485)
Fixes #78290
Here's a screenshot of the modified doc:
![asarray](https://user-images.githubusercontent.com/3337141/170971723-aafe20a9-8e51-420f-ae98-67dc2df579a2.png)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/78485
Approved by: https://github.com/ngimel