Docs - Update Data List guidelines

[bekah-stephens]

Description

The current “Variations” and “Spacing” sections are separated and relay similar information about the two types of Data List: Compact and Default

Recommendation / Fix

1. Pull the descriptions from the “Spacing” section up to the “Variations” section
2. Remove the “Spacing” section (now that we use tokens, these visual examples aren’t helpful anyways)

The images related to these sections have been updated/removed in this PR, but text content needs to be updated/removed for both.