docs: fix navigation labels to match section names

[ykdojo]

Summary

• Replace generic "Overview" labels with descriptive section names in sticky header navigation

Before & after

fix.nav.labels_trimmed_1.5x.mov

Test plan

• Verify documentation builds successfully
• Check that sticky headers now show proper section names instead of "Overview"

Internal note

Closes EVE-845

[greptile-apps]

Greptile Summary

This PR improves the documentation navigation by replacing generic "Overview" labels with descriptive section names in the sticky header navigation. The changes are made to docs/SUMMARY.md, which appears to be a table of contents or navigation structure file for the Daft documentation.

Specifically, the PR updates 7 navigation labels to be more descriptive:

• Generic "Overview" labels are replaced with specific section names like "Modalities", "Custom Code", "Connectors", "Optimization", "Examples", "Python API", and "SQL Reference"
• These changes affect the sticky header navigation that users see when browsing the documentation

This change fits into the broader documentation ecosystem of the Daft project, which maintains comprehensive documentation in the /docs directory. The modification enhances user experience by providing more contextual information in the navigation interface, making it easier for users to understand which section they're currently viewing and navigate between different areas of the documentation.

Confidence score: 5/5

• This PR is safe to merge with minimal risk as it only contains cosmetic documentation improvements
• Score reflects the non-functional nature of the changes - updating navigation labels cannot break existing functionality or introduce bugs
• No files require special attention as this is a straightforward documentation enhancement

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