docs: nest Understanding dimension anomalies under a Dimension anomalies group

[NoyaOffer]

What

Nests Understanding dimension anomalies under a collapsible Dimension anomalies group in the sidebar, instead of leaving it as a flat sibling that reads as an orphaned top-level page.

Before:

• Dimension anomalies
• Understanding dimension anomalies   ← flat sibling
• All columns anomalies

After:

▸ Dimension anomalies
    • Dimension anomalies
    • Understanding dimension anomalies
• All columns anomalies

Changes

• docs/docs.json — wrap the two dimension pages in a Dimension anomalies group under the Anomaly Detection Tests nav.

Nav-only change. mintlify broken-links passes.

🤖 Generated with Claude Code

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