Updating old source freshness language

[matthewshaver]

What are you changing in this pull request and why?

Updates antiquated source freshness language

Closes #1210

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.

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

• https://docs-getdbt-com-git-snapshotting-dbt-labs.vercel.app/docs/build/dbt-tips
• https://docs-getdbt-com-git-snapshotting-dbt-labs.vercel.app/docs/build/sources
• https://docs-getdbt-com-git-snapshotting-dbt-labs.vercel.app/docs/dbt-cloud-apis/discovery-use-cases-and-examples
• https://docs-getdbt-com-git-snapshotting-dbt-labs.vercel.app/docs/deploy/artifacts
• https://docs-getdbt-com-git-snapshotting-dbt-labs.vercel.app/docs/deploy/source-freshness
• https://docs-getdbt-com-git-snapshotting-dbt-labs.vercel.app/faqs/Models/insert-records
• https://docs-getdbt-com-git-snapshotting-dbt-labs.vercel.app/guides/productionize-your-dbt-databricks-project
• https://docs-getdbt-com-git-snapshotting-dbt-labs.vercel.app/guides/refactoring-legacy-sql
• https://docs-getdbt-com-git-snapshotting-dbt-labs.vercel.app/reference/artifacts/dbt-artifacts
• https://docs-getdbt-com-git-snapshotting-dbt-labs.vercel.app/reference/artifacts/sources-json
• https://docs-getdbt-com-git-snapshotting-dbt-labs.vercel.app/reference/commands/source
• https://docs-getdbt-com-git-snapshotting-dbt-labs.vercel.app/reference/source-configs

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[mirnawong1]

great change @matthewshaver ! approved!