docs: add SolidRPC RPC endpoints

[DamianFigiel]

Summary

• add the live SolidRPC keyless BSC endpoint to the mainnet endpoint list
• add SolidRPC to the RPC provider list

Endpoint: https://rpc.solidrpc.io/public/evm/56
Documentation: https://solidrpc.io/docs/public-rpc

[hashdit-bot]

Pull Request Review

This documentation-only PR adds SolidRPC’s keyless BSC mainnet JSON-RPC endpoint to the endpoint list and adds SolidRPC to the RPC provider directory. It also removes trailing whitespace and adds a final newline.

Sensitive Content

No sensitive content detected.

Security Issues

No serious security issues detected.

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[DamianFigiel]

SolidRPC’s keyless BSC endpoint remains live at https://rpc.solidrpc.io/public/evm/56. The PR only updates the existing endpoint and provider directories. Please let me know if BNB Chain currently has additional inclusion or verification requirements for third-party RPC providers.