Fix broken Solidity snippet (callback example did not compile)

[Meesut0]

What changed? Why?
The intermediate callback snippet (lines 211–218) did not compile due to incorrect variable names used inside the function body.

The function parameters were defined as _nonce and _rngList, but the snippet referenced nonce and rngList, resulting in multiple DeclarationError: Undeclared identifier errors.

How has it been tested?
Steps taken:

• Copied the snippet into Remix IDE
• Confirmed compilation failed
• Replaced rngList > _rngList
• Replaced nonce > _nonce
• Recompiled successfully

The snippet is now consistent with the final contract example and compiles correctly.

[cb-heimdall]

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