Add introduced section

Author: alihcsumer

content/en/docs/apidocs-mxsdk/apidocs/pluggable-widgets/pluggable-widgets-property-types.md

@@ -475,6 +475,10 @@ Then the Studio Pro UI for the property appears like this:
 
 ### Action {#action}
 
+{{% alert color="info" %}}
+The `defaultType` and `defaultValue` attributes for Action was introduced in Mendix [10.15](/releasenotes/studio-pro/10.15/).
+{{% /alert %}}
+
 The action property type allows a user to configure an action which can do things like call nanoflows, save changes, and open pages.
 
 If a `dataSource` attribute is not specified, the client will receive an `ActionValue` representing the action or `undefined` if the **Do nothing** action was selected.