docs: Minor content update (#6172)

website/content/docs/api/index.mdx

@@ -13,7 +13,11 @@ Before reading this page, it is useful to understand Boundary's [domain model](/
 
 Boundary's API is also described via OpenAPI v2; the version corresponding to any tag of Boundary's source code can be found in Boundary's [GitHub repository](https://github.com/hashicorp/boundary/blob/main/internal/gen/controller.swagger.json).
 
--> **NOTE:** A rendered version of this generated API definition can be found on the [API page](/boundary/api-docs).
+<Note>
+
+Refer to the [API page](/boundary/api-docs) for a rendered version of this generated API definition.
+
+</Note>
 
 Boundary's current API version is 1; all API paths begin with `/v1/`.