text: Title: DOC: `np` is alias both for `numpy` and `xorbits.numpy` which may cause ambiguity
  Body: ![image](https://user-images.githubusercontent.com/109654808/211239986-0dbe33e7-1ec7-46fa-a93d-9d4bba34cc42.png)
  
  After `import numpy as np`, the `np` has become numpy instead of xorbits.numpy, I recommend to use `import numpy` directly.