Update 3-intermediate.md to add missing word

[tamora-dawn]

What are you changing in this pull request and why?

A word is missing in this clause: "By descriptively labeling the transformations happening inside our CTEs within model".
I believe it should say: "By descriptively labeling the transformations happening inside our CTEs within our model".

Checklist

• I have reviewed the Content style guide so my content adheres to these guidelines.
• [n/a] 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.
• [n/a] 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."
• [n/a] 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.
We'll review your contribution and respond as soon as we can. 😄

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[mirnawong1]

hey @tamora-dawn , great catch and yes that was missing ! really appreciate you opening this up and looking forward to future contributions ✨