Remove outdated restriction for docs nesting (#746)

docs/api-site-config.md

@@ -78,7 +78,7 @@ headerLinks: [
 
 `cname` - The CNAME for your website. It will go into a `CNAME` file when your site it built.
 
-`customDocsPath` - By default, Docusaurus expects your documentation to be in a directory called `docs`. This directory is at the same level as the `website` directory (i.e., not inside the `website` directory). You can specify a custom path to your documentation with this field. **Note that all of your documentation `*.md` files must still reside in a flat hierarchy. You cannot have your documents in nested directories**.
+`customDocsPath` - By default, Docusaurus expects your documentation to be in a directory called `docs`. This directory is at the same level as the `website` directory (i.e., not inside the `website` directory). You can specify a custom path to your documentation with this field.
 
 ```js
 customDocsPath: 'docs/site';