[docs-scanner] Inconsistent legacy subscription messaging across subscription docs

[docker-agent]

File: content/manuals/subscription/manage-seats.md

Issue

The manage-seats.md file also uses the "Legacy Docker subscription" tab pattern, creating inconsistency with how legacy subscriptions are handled across the subscription documentation section.

The same tabs appear in:

• Add seats to your subscription
• Remove seats from your subscription

This is part of a broader pattern where multiple files in the subscription directory reference legacy subscriptions without clear guidance on:

1. What makes a subscription "legacy"
2. Whether users should still be following these instructions
3. When or if these instructions will be removed

Suggested fix

Coordinate with the fix for change.md (#24305) to ensure consistent handling of legacy subscription documentation across all files in content/manuals/subscription/. Apply the same approach (removal, deprecation notice, or clarification) to all files that reference legacy subscriptions.

Files affected:

• change.md
• manage-seats.md
• scale.md (has a note about legacy subscriptions)

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Found by nightly documentation freshness scanner