FIx typo in documentation

[TXHENG]

The correct path for Magento Open Source example should be

cp -R graphcommerce/examples/magento-open-source/. my-project && cd my-project

instead of

cp -R graphcommerce/examples/magento-magento-open-source/. my-project && cd my-project

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Name	Status	Preview	Updated (UTC)
graphcommerce-hygraph-dynamic-rows-ui	✅ Ready (Inspect)	Visit Preview	Feb 7, 2025 1:46am

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[paales]

Thanks!