Fixed a few typos in dense-vector.md

[ImadSaddik]

Hi, while reading about the dense vector field type, I found a few typos that I fixed.

• similariy → similarity
• linearlly → linearly
• betwee → between

[github-actions]

🔍 Preview links for changed docs

• docs/reference/elasticsearch/mapping-reference/dense-vector.md

[github-actions]

ℹ️ Important: Docs version tagging

👋 Thanks for updating the docs! Just a friendly reminder that our docs are now cumulative. This means all 9.x versions are documented on the same page and published off of the main branch, instead of creating separate pages for each minor version.

We use applies_to tags to mark version-specific features and changes.

Expand for a quick overview

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✅ At the page level to indicate which products/deployments the content applies to (mandatory)
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