feat: simplify country mock docs

[eduardoboucas]

Summary

This PR changes the command description to make it a little less scary, removing some information about the ISO codes. It also uses a ntl.fyi shortlink for the country codes.

[github-actions]

📊 Benchmark results

Comparing with 65913b4

Package size: 221 MB

⬇️ 0.00% decrease vs. 65913b4

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Legend

• T-30 (5558446): 221 MB
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• T-1 (65913b4): 221 MB
• T (current commit): 221 MB

[danez]

Needs a rebase.