Add link to SAMPLE in distinctive-features.md

[petern48]

Summary

Closes #2962.

Checklist

• Delete items not relevant to your PR
• URL changes should add a redirect to the old URL via https://github.com/ClickHouse/clickhouse-docs/blob/main/docusaurus.config.js
• If adding a new integration page, also add an entry to the integrations list here: https://github.com/ClickHouse/clickhouse-docs/blob/main/docs/en/integrations/index.mdx

[petern48]

"Vercel — Authorization required to deploy." I'm guessing that's for a maintainer and not me right?