Update warning and info alerts in model-reflection.md

Clarified instructions regarding the removal of the _USE_ME/_DEPRECATED directory for compatibility with Mx Model Reflection.

Author: jdiehl

content/en/docs/marketplace/platform-supported-content/modules/model-reflection.md

@@ -9,8 +9,12 @@ description: "Describes the configuration and usage of the Mx Model Reflection m
 
 The [Mx Model Reflection](https://marketplace.mendix.com/link/component/69/) module allows you to access information about the domain model and about microflows of your app from your app. For example, you can loop through all the attribute names of an entity type in a microflow.
 
+{{% alert color="warning" %}}
+If your application depends on assets located in the **_USE_ME/_DEPRECATED** directory (e.g., select pages), do not upgrade Mx Model Reflection to version 9.1.0 or later. This directory has been removed starting with those versions. Update your application to remove any use on these assets. If the usage originates from a marketplace module, contact the author and request that they remove the deprecated dependencies.
+{{% /alert %}}
+
 {{% alert color="info" %}}
-To use MxModel Reflection with the React client, remove the folder **_USE_ME/_DEPRECATED**. The assets in this folder are there only for backwards compatibility, and are not necessary to make full use of MxModel Reflection.
+In older versions of MxModel Reflection, remove the folder **_USE_ME/_DEPRECATED** to enable its use with the React client. The assets in this folder are there only for backwards compatibility, and are not necessary to make full use of MxModel Reflection.
 {{% /alert %}}
 
 ### Dependencies