Update compiling-a-contract.rst

[NikolaiKryshnev]

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What I did

Replaced outdated GitHub Wiki link to Ethereum Contract ABI with the current official Solidity documentation link.

How I did it

Updated the comment in the code:

- // See https://github.com/ethereum/wiki/wiki/Ethereum-Contract-ABI
+ // See https://docs.soliditylang.org/en/latest/abi-spec.html

How to verify it

• Open the updated link in a browser.
• Confirm it points to the official Solidity ABI specification.
• Ensure the comment compiles fine (no impact on code).

Commit message

docs: update Ethereum Contract ABI reference link

Replaced outdated GitHub Wiki link with the official Solidity ABI specification link at https://docs.soliditylang.org/en/latest/abi-spec.html.

Description for the changelog

• Updated outdated Ethereum Contract ABI reference link in comments to point to the official Solidity documentation.

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