[D&M] Changes ML node capacity for trials (#1587)

## Overview

Related to elastic/developer-docs-team#298

The provided capacity for ML nodes in trials has changed from `4 GB` to
`8 GB` in the case of using Reranker. This PR adjusts the docs to
reflect this change.

---------

Co-authored-by: David Kilfoyle <[email protected]>

Author: szabosteve

deploy-manage/deploy/elastic-cloud/create-an-organization.md

@@ -76,7 +76,7 @@ During the free 14 day trial, Elastic provides access to one hosted deployment a
 
 * You can have one active deployment at a time
 * The deployment size is limited to 8GB RAM and approximately 360GB of storage, depending on the specified hardware profile
-* Machine learning nodes are available up to 4GB RAM
+* Machine learning nodes are available up to 4GB RAM, or up to 8GB when using Reranker
 * Custom {{es}} plugins are not enabled
 
 For more information, check the [{{ech}} documentation](cloud-hosted.md).