Update percentiles query to use WITHIN GROUP

[alexmojaki]

Closes #1044

[Copilot]

Pull Request Overview

This PR updates the sample query in the documentation to use the WITHIN GROUP syntax for computing percentiles, aligning it with the latest recommended query patterns.

• Replaces the original extraction of duration in milliseconds with a multiplication of the duration by 1000.
• Updates percentile function calls to the new WITHIN GROUP pattern.

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[hyperlint-ai]

PR Change Summary

Updated the percentiles query to utilize the WITHIN GROUP clause for improved accuracy in calculating percentiles.

• Modified the SQL query to use WITHIN GROUP for percentile calculations.
• Changed the way duration is calculated in the query.

Modified Files

• docs/integrations/web-frameworks/index.md

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