[docs-scanner] Remove time-relative language 'currently' from build-cloud overview

[docker-agent]

File: content/manuals/build-cloud/_index.md

Issue

The documentation uses the time-relative word "currently" which is prohibited by STYLE.md because it goes stale silently:

Docker Build Cloud is currently only available in the US East region. Users
in Europe and Asia may experience increased latency compared to users based
in North America.

Support for multi-region builders is on the roadmap.

Suggested fix

Remove "currently" and state the fact directly. If multi-region support is still on the roadmap, consider whether that statement also needs updating or removal. Suggested revision:

Docker Build Cloud is only available in the US East region. Users
in Europe and Asia may experience increased latency compared to users based
in North America.

Or if multi-region support has been added, update the entire section to reflect the current state.

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Found by nightly documentation freshness scanner