Update ClickHouse doc (#5900)

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

Update ClickHouse DBT documentation.

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## 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] Add a checklist item for anything that needs to happen before
this PR is merged, such as "needs technical review" or "change base
branch."

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Co-authored-by: Matt Shaver <[email protected]>