docs: add BoltRPC as BSC RPC provider

[KubilayJackson]

Summary

• Add BoltRPC to the BSC RPC Providers list on the JSON-RPC endpoint docs
• BoltRPC provides HTTPS + WebSocket JSON-RPC for BNB Smart Chain (chain ID 56)

Links

• Provider / product: https://boltrpc.io
• BNB Chain endpoint docs: https://boltrpc.io/networks/bnb
• API docs: https://boltrpc.io/docs

Notes

• Endpoints require an API key (same model as other listed providers such as QuickNode / Alchemy)
• No keyless public dataseed URL is being added in this PR

Test plan

• Confirm the BoltRPC provider bullet renders on the JSON-RPC endpoint page after merge
• Confirm https://boltrpc.io/networks/bnb loads and documents BSC (chain ID 56)

[hashdit-bot]

Pull Request Review

This documentation-only PR adds BoltRPC to the list of third-party BNB Smart Chain RPC providers, linking to its BNB network page. It does not add an RPC endpoint, API key, executable code, or configuration changes.

Sensitive Content

No sensitive content detected.

Security Issues

No serious security issues detected.

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