Update docker-install.md fixing broken link

[ai2ys]

What are you changing in this pull request and why?

A link in the markdown file resulted in a 404 error. The corresponding link is fixed in this merge request.

Checklist

• Review the Content style guide so my content adheres to these guidelines.
• For docs versioning, review how to version a whole page and version a block of content.
• Add a checklist item for anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."

[welcome]

Hello!👋 Thanks for contributing to the dbt product documentation and opening this pull request! ✨
We use Markdown and some HTML to write the dbt product documentation. When writing content, you can use our style guide and content types to understand our writing standards and how we organize information in the dbt product docs.
We'll review your contribution and respond as soon as we can. 😄

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Name	Status	Preview	Comments	Updated (UTC)
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[mirnawong1]

hey @ai2ys great catch and thanks for opening up this pr! I've updated it a bit and approved it for merge. looking forward to future contributions ✨