Update use-aadhttpclient-enterpriseapi.md

Changed description about value of resource since referring GUID is no longer supported.

Author: JarbasHorst

docs/spfx/use-aadhttpclient-enterpriseapi.md

@@ -275,7 +275,7 @@ In the **solution** property, add a new property named `webApiPermissionRequests
 }
 ```
 
-The value of the **resource** property refers to either the name or the ID of the Azure AD application used to secure the API. Using the name is more readable and easier to maintain over time. The value of the **scope** property specifies the permission scope that your solution needs in order to communicate with the API. In this tutorial, Azure AD is used only to secure the API, so `user_impersonation` is the scope that you will use.
+The value of the **resource** property must refer to the name of the Azure AD application used to secure the API. The value of the **scope** property specifies the permission scope that your solution needs in order to communicate with the API. In this tutorial, Azure AD is used only to secure the API, so `user_impersonation` is the scope that you will use.
 
 > [!NOTE]
 > If you want to connect to an enterprise API that has been created previously, contact your administrator to provide you with details for the Azure AD application used to secure it. You will need information such as the application ID, permissions the application exposes, and the audience it's configured to.