[data grid][docs] Audit and revise the tree data doc (@mapache-salvaje)

[github-actions[bot]]

Cherry-pick of #17650

[mui-bot]

Deploy preview: https://deploy-preview-17918--material-ui-x.netlify.app/

Updated pages:

• docs/data/data-grid/tree-data/tree-data.md

Generated by :no_entry_sign: dangerJS against 013414b01900b80a28bddcd188d87d704ac8a61d

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This pull request has conflicts, please resolve those before we can evaluate the pull request.

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This pull request has been inactive for 30 days. Please remove the stale label or leave a comment to keep it open. Otherwise, it will be closed in 15 days.

[github-actions[bot]]

This pull request has been closed due to 15 days of inactivity after being marked stale.