[Writer] Add eth_getWithdrawalProof CU cost for MegaETH

[JackReacher0807]

Closes DOCS-44.

Change

Adds a new # MegaETH: Specific Methods section to the Compute Unit Costs page with an entry for eth_getWithdrawalProof at 20 CU, applicable to MEGAETH_TESTNET and MEGAETH_MAINNET.

Why this structure

The page already uses a per-chain "Specific Methods" pattern for chains that support non-standard RPC methods or chain-specific variants (Polygon PoS, Polygon zkEVM, Citrea, Linea, zkSync Era, etc.). Even though eth_getWithdrawalProof uses the eth_ namespace, it's only supported on MegaETH, so adding it to the chain-agnostic EVM: Standard JSON-RPC Methods table would be misleading. A dedicated MegaETH: Specific Methods section (placed next to Linea, another L2) is consistent with the existing convention, and I added a short note clarifying that the section applies to both MegaETH testnet and mainnet.

Test plan

• Visually verified the rendered table in the diff
• No other pages touched

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