Correct instructions for running GraphQL functional tests

[keharper]

Description

Affected page: https://devdocs.magento.com/guides/v2.4/graphql/functional-testing.html#run-functional-tests

Update the path for running the tests as described at the bottom of https://github.com/magento/magento2/issues/32252

[m2-assistant[bot]]

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[sprankhub]

Please mind that this also affects integration tests.