Update vtex-io-documentation-what-is-vtex-io.md

[carolinamenezes]

Types of changes

• [ ] New content (guides, endpoints, app documentation)
• [x] Improvement (make a documentation even better)
• [ ] Fix (fix a documentation error)
• [ ] Spelling and grammar accuracy (self-explanatory)

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• https://developers.vtex.com/docs/guides/vtex-io-documentation-what-is-vtex-io

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