Documentation for direct binary access is unclear

In the opening paragraph of the documentation on Direct Binary Access, reference is made to S3DataStore and AzureDataStore as blob stores that support this feature, but is is not clear whether they are mentioned as examples or as an exhaustive list of supporting blob stores. It is only on further examination of the documentation that you are able to determine that the list was specific and not as examples.
We should change the documentation so it is more clear up front which blob stores support the feature.