Update page title for source configs (#3956)

[Preview](https://deploy-preview-3956--docs-getdbt-com.netlify.app/reference/source-configs)

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

Here are the page titles to document the `config` for many of the
resource types:
- [Model
configurations](https://docs.getdbt.com/reference/model-configs#general-configurations)
- [Seed
configurations](https://docs.getdbt.com/reference/seed-configs#general-configurations)
- [Snapshot
configurations](https://docs.getdbt.com/reference/snapshot-configs#general-configurations)
- [About source
configurations](https://docs.getdbt.com/reference/source-configs#general-configurations)
- [Test
configurtations](https://docs.getdbt.com/reference/test-configs#general-configurations)

Notice that one is not like the others!

Let's fix that 😎

## 🎩 

### Before

<img width="250" alt="image"
src="https://github.com/dbt-labs/docs.getdbt.com/assets/44704949/b95e0615-59c6-4453-83f1-41532159b29f">

### After

<img width="250" alt="image"
src="https://github.com/dbt-labs/docs.getdbt.com/assets/44704949/ba266d1d-34cc-4133-9d93-01c97c621d45">

## Checklist
- [x] Review the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
and [About
versioning](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#adding-a-new-version)
so my content adheres to these guidelines.

website/docs/reference/source-configs.md

@@ -1,5 +1,5 @@
 ---
-title: "About source configurations"
+title: Source configurations
 description: "Learn how to use source configurations in dbt."
 id: source-configs
 ---