docs: add 128mb/6s instructions

[rach-id]

Overview

Closes #2258

[gemini-code-assist]

Summary of Changes

Hello @rach-id, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the nodes-overview.md documentation to provide essential hardware guidance for validators. It specifically addresses the CPU requirements for nodes upgrading to the 128mb/6s configuration, ensuring operators have the necessary information to select appropriate hardware for optimal network performance and stability.

Highlights

• Validator Hardware Requirements: Added specific CPU hardware requirements for validators when upgrading to the 128mb/6s configuration.
• CPU Benchmark and Recommendations: Included links to the CPU benchmark tool and release notes for tested CPUs, along with recommended specifications such as 32+ cores, GFNI, and SHA-NI support.

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[gemini-code-assist]

Code Review

This pull request adds important information about hardware requirements for validators when upgrading to 128mb/6s. The changes are clear and provide useful links to a CPU benchmark and release notes. I've added one suggestion to improve the structure and clarity of the new section to avoid potential confusion with the existing hardware requirements table. Overall, a good addition to the documentation.