Update what-is-a-vector-database.mdx

[lostvikx]

The bullet points were duplicate.

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PR Change Summary

Removed duplicate bullet points regarding distance metrics in vector search documentation.

• Eliminated duplicate information about distance metrics in vector search.
• Streamlined content for clarity and conciseness.

Modified Files

• src/content/docs/vectorize/reference/what-is-a-vector-database.mdx

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