Update logistics terminology in VTEX Tracking article

[Isabella-Veloso]

Correcting broken links, markdown errors and updating Logistics terminology from "Infinite inventory" to "Unlimited inventory".

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)

[github-actions[bot]]

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[github-actions[bot]]

Preview Links

Open this URL to set up the portal with this branch changes.

You can now access the edited pages with the following URLs:

• https://developers.vtex.com/docs/guides/integrate-external-orders-vtex-tracking