Files with Jinja support

[nataliefiann]

What are you changing in this pull request and why?

Closes; #3343

Checklist

• The changes in this PR meet the docs style guide/fundamentals required for all content.
• Applied the proper versioning rules if the content is for specific dbt version(s): (version a whole page or version a block of content
• The content in this PR requires a dbt release note, so I added one to the release notes page.).

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🚀 Deployment available! Here are the direct links to the updated files:

• https://docs-getdbt-com-git-nfiann-jinja-dbt-labs.vercel.app/reference/files-with-jinja-support

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Project	Deployment	Preview	Updated (UTC)
docs-getdbt-com	Ready	Preview	Aug 22, 2025 2:37pm

[nataliefiann]

Queried with team here: https://dbt-labs.slack.com/archives/C04559AB7D2/p1765884654874189

[nataliefiann]

Documentation plan

This PR relates to this issue

I think this should be a new page titled: Files with Jinja support**

Questions:

I created this PR before going on leave and didn't request a review. I documented the following:

• dbt built-in macros
• Bring-your-own
• Generic Jinja expressions, statements, and comments
• Jinja in common types of dbt files:
• Examples

1. Are these headers sufficient for the doc?
2. Is it a good idea to have this as a new page?