Update withdrawals.md

[therealharpaljadeja]

Add comma before withdrawalHash in waitToFinalize step

This PR is solving a syntax error in the OP Stack Withdrawal example, specifically the part where we wait for transaction to finalize on L1.

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PR-Codex overview

This PR updates the withdrawals.md file in the op-stack directory to fix a syntax error in the waitToFinalize function call.

Detailed summary

• Fixed syntax error by adding a comma after walletClientL2.chain in the waitToFinalize function call.

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