Fix instructions for Zig/collatz-conjecture

[cizra]

No description provided.

[github-actions]

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[everett-hayes]

+1

[ee7]

Thanks for the PR and the forum post.

I'll resolve this soon - probably by adding an extra @compileError instead. Sorry for the pain here - I fully agree that this should be clearer. It's especially bad because it's an early exercise.

See also #360 (comment).

This PR cannot be merged as-is because the instructions.md file for a practice exercise is defined upstream. A track should only append to the given instructions, and do that via a separate .append file. I've done that in #369.