ORC-1114: Update `Using with Python` page with `PyArrow` 7.0.0 (#1042)
ORC-1114: Update `Using with Python` page with `PyArrow` 7.0.0 (#1042)

### What changes were proposed in this pull request?

This PR aims to update `Using with Python` page with new PyArrow 7.0.0 API.

- https://pypi.org/project/pyarrow/7.0.0/

### Why are the changes needed?

New APIs are more convenient.

### How was this patch tested?

<img width="685" alt="Screen Shot 2022-02-03 at 9 07 51 PM" src="https://user-images.githubusercontent.com/9700541/152475373-5b6e308d-6d52-4275-9fe4-b822245f44bc.png">

apache/orc,apache/orc,apache/orc,apache/orc,apache/orc,apache/orc,apache/orc,apache/orc