Update repo caching (#4684)

## What are you changing in this pull request and why?

Update repo caching section below so it includes info about the
situations when dbt Cloud uses the cached copy instead


https://docs.getdbt.com/docs/deploy/deploy-environments#git-repository-caching

## Checklist
- [x] Review the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
so my content adheres to these guidelines.
- [x] For [docs
versioning](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#about-versioning),
review how to [version a whole
page](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#adding-a-new-version)
and [version a block of
content](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#versioning-blocks-of-content).
- [x] Needs review from product team

website/snippets/_cloud-environments-info.md

@@ -42,6 +42,13 @@ For improved reliability and performance on your job runs, you can enable dbt Cl
 
 dbt Cloud caches your project's Git repo after each successful run and retains it for 8 days if there are no repo updates. It caches all packages regardless of installation method and does not fetch code outside of the job runs. 
 
+dbt Cloud will use the cached copy of your project's Git repo under these circumstances:
+
+- Outages from third-party services (for example, the [dbt package hub](https://hub.getdbt.com/)).
+- Git authentication fails.
+- There are syntax errors in the `packages.yml` file. You can set up and use [continuous integration (CI)](/docs/deploy/continuous-integration) to find these errors sooner.
+- If a package doesn't work with the current dbt version. You can set up and use [continuous integration (CI)](/docs/deploy/continuous-integration) to identify this issue sooner.
+
 To enable Git repository caching, select **Account settings** from the gear menu and enable the **Repository caching** option. 
 
 <Lightbox src="/img/docs/deploy/example-repo-caching.png" width="85%" title="Example of the Repository caching option" />