Update profile.md

Add description about properties (pronouns) that are not exposed on Microsoft Graph

Author: Ragnhild

api-reference/beta/resources/profile.md

@@ -18,6 +18,8 @@ Represents properties that are descriptive of a user in a tenant, for example, a
 
 Programmatically, these properties are expressed as [relationships](#relationships) of the **profile** resource. To get one of these navigation properties or create an instance of these properties for the user, use the corresponding GET or POST method on that property, where applicable. See the [methods](#methods) listed below.
 
+In addition to the properties and collections outlined in the Relationship section, there are additional collections and properties that are exclusively accessible to first-party applications, and they are not exposed on Microsoft Graph. These collections include, for example, the users pronouns.
+
 ## Methods
 
 | Method                                                                     | Return Type                                                    | Description                                                                                  |