docs: Format docs (#15352)

This PR formats the rest of the docs' source files.

I'll follow up with a CI check to ensure they stay formatted.

Release Notes:

- N/A

docs/src/languages/javascript.md

@@ -143,6 +143,6 @@ You can configure ESLint's `rulesCustomizations` setting:
 }
 ```
 
-
 ## Yarn integration
+
 See [Yarn documentation](./yarn.md) for a walkthrough of configuring your project to use Yarn.