fix: Add missing paren in star macro blog

[kiyanmair]

What are you changing in this pull request and why?

What: Adding a parenthesis which was missing from a code snippet in the blog post "A star (generator) is born" (link).

Why: I noticed this issue while reading the blog post, and people might be confused if they copy and paste the code snippet.

Checklist

• I have reviewed the Content style guide so my content adheres to these guidelines.
• The topic I'm writing about is for specific dbt version(s) and I have versioned it according to the version a whole page and/or version a block of content guidelines.
• I have added checklist item(s) to this list for anything anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."
• The content in this PR requires a dbt release note, so I added one to the release notes page.

[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.
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[vercel]

@kiyanmair is attempting to deploy a commit to the dbt-labs Team on Vercel.

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[mirnawong1]

hey @kiyanmair , thanks for opening this up and great catch! you're absolutely right and I'll get this merged for you! ✨