Infinite Scroll: Provide examples on how to use it in Woo and how to customize labels

### Impacted plugin

Jatpack

### What

I would like to have better examples on how to use Infinite Scroll

### How

It would be great to improve [the Infinite Scroll documentation page](https://jetpack.com/support/infinite-scroll/) and provide examples showing the following:

- how to alter the 'Load older posts' button label
- how to use Infinite Scroll on Woo product list

It also needs to be clarified where users should put provided code samples.

Start with the linked Infinite Scroll documentation page and review its existing guidance. Add examples for changing the “Load older posts” label and using Infinite Scroll with a Woo product list, and clarify where users should place the provided code samples.

Written by the indexing model from the issue text.