Fix missing main() invocation in transaction example

[CryptAm]

Description

Adds a missing main() invocation to the ethers.js transaction example so the script executes when run.

Issue(s) fixed

N/A

Fixes #

Preview

N/A

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Note

Updates the ethers.js transaction tutorial to ensure the sample script actually runs.

• Adds main() invocation in services/tutorials/ethereum/send-a-transaction/send-a-transaction-ethers.md example code block so node eip1559_tx.js executes the flow as documented

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