Fixed a bug in quickstart guide code block

[priyeshvpotdar]

In the code block, loop was missing which could lead to incorrect interpretation and understanding, when referring to the official documentation.

[sre-ci-robot]

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[sre-ci-robot]

Welcome @priyeshvpotdar! It looks like this is your first PR to milvus-io/milvus-docs 🎉

[zc277584121]

The same fixing https://github.com/milvus-io/milvus-docs/pull/2796