Update testground/README.md

Signed-off-by: yihuang <huang@crypto.com>
crypto-org-chain · Jun 21, 2024 · 7c1bf58 · 7c1bf58
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commit 7c1bf58
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diff --git a/testground/README.md b/testground/README.md
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 ## Build Image
 
->  Prerequisites: nix, linux remote builder for macOS
+>  Prerequisites: nix, for macOS also need [linux remote builder](https://nix.dev/manual/nix/2.22/advanced-topics/distributed-builds.html)
 
 You can test with the prebuilt images in [github registry](https://github.com/crypto-org-chain/cronos/pkgs/container/cronos-testground), or build the image locally: