[docs] add missing keys to enumerated elements (#23604)

chore(docs): integrate config plugins doc (#23560)

# Why

The original doc was a large markdown file that we brought over. This PR
aims to integrate the doc better with the Expo docs by using bui

chore(docs): integrate config plugins doc (#23560)

# Why

The original doc was a large markdown file that we brought over. This PR
aims to integrate the doc better with the Expo docs by using built-in
components.


<!--
Please describe the motivation for this PR, and link to relevant GitHub
issues, forums posts, or feature requests.
-->

# How

Added the ability to pass a note to the `FileTree` and replaced the
markdown blocks with `FileTree`s.


## Before

<img width="662" alt="Screenshot 2023-07-16 at 8 43 09 PM"
src="https://github.com/expo/expo/assets/9664363/923ed351-e66a-40c5-a1d3-553c1f9e14e0">

## After

I'm not especially in love with this, but it is better than the code
block.

<img width="670" alt="Screenshot 2023-07-16 at 8 42 57 PM"
src="https://github.com/expo/expo/assets/9664363/df5e8106-ea10-4540-ab7b-c51a4eee228d">

On smaller screens, the note will scroll instead of wrap.

<img width="505" alt="Screenshot 2023-07-16 at 8 48 51 PM"
src="https://github.com/expo/expo/assets/9664363/9ec54840-4765-4c5a-9e4a-f3e60d58d2b6">

show more ...