docs(l2): update L2 roadmap status

[ilitteri]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the L2 roadmap documentation to reflect current progress on various features by changing their status from "Planned" or "In Progress" to more current states.

• Updated status for Native Bridge and Risc0 Support from "In Progress" to "Done"
• Updated status for Shared Bridge, Custom Native Token, and Gas & Fees from "Planned" to "In Progress"
• Minor formatting improvements to table alignment

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