[DX] Docs: Revamp `shared-node-data.md`

[Celia Usero Navarro]

📚 Context

Focuses on the Usability area for the DX epic

🛠 Acceptance Criteria

The developer-knowledgebase/shared-node-data.md document is potentially outdated

• Verify if the current description is truthy, and edit it if not
• Edit the instructions accordingly with supporting information and diagrams (if applicable)