Add info box in account registration section

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>

content/client-server-api/_index.md

@@ -477,8 +477,7 @@ the API that was used to obtain their current access token.
 
 {{% boxes/note %}}
 Currently the OAuth 2.0 API doesn't cover all the use cases of the legacy API,
-such as automated applications that cannot use a web browser, or
-user management by [application services](application-service-api/#server-admin-style-permissions).
+such as automated applications that cannot use a web browser.
 {{% /boxes/note %}}
 
 ### Authentication API discovery
@@ -502,6 +501,12 @@ user must do that directly in the homeserver's web UI. However, the client can
 signal to the homeserver that the user wishes to create a new account with the
 [`prompt=create`](#user-registration) parameter during authorization.
 
+{{% boxes/note %}}
+{{% added-in v="1.17" %}}
+Application services can use the `/register` endpoint to create users regardless
+of the authentication API supported by the homeserver.
+{{% /boxes/note %}}
+
 ### Login
 
 With the legacy API, a client can obtain an access token by using one of the