fix(List): Updated examples for List component

[silvalaura]

Issue: #1073

What I did

We originally thought our List component didn't support nested children. However, it does, we just needed examples of it. This is adding examples to docs and storybook.

Screenshots:

Checklist

• [X] changeset has been added
• [X] Pull request description is descriptive
• [X] I have made corresponding changes to the documentation
• [X] New and existing unit tests pass locally with my changes
• [-] I have added tests that prove my fix is effective or that my feature works

How to test

Confirm that the List component can have nested children, and that all the examples in the docs are functional and make sense.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 9808ecb709a3bf395d55a5bbbdcebc50402727bf

The changes in this PR will be included in the next version bump.

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