Update the method numbering and explanation

Current doc tells IT admins should use one of the methods to find apps that use AAD Graph. However, each method has different approaches and no method is perfect.

concepts/migrate-azure-ad-graph-faq.md

@@ -44,7 +44,7 @@ If you own an application's source code, search for the `https://graph.windows.n
 
 ## As an IT admin, how do I identify apps in my tenant that use Azure AD Graph?
 
-Use one of the following three methods to identify apps in your tenant with a dependency on Azure AD Graph.
+Use the following four methods to identify apps in your tenant with a dependency on Azure AD Graph. Method 1 and 2 identify your apps that use Azure AD Graph based on the actual app activities while method 3 and 4 use static app configuration and consent status. You can combine these methods to find apps that have a dependency on Azure AD Graph.
 
 ### Method 1: Through network proxy logs
 
@@ -67,7 +67,7 @@ Check your network server traffic logs through a filter proxy for any apps calli
 
     :::image type="content" source="/graph/images/aadgraph-to-msgraph-migration/RequestedAPI-AAD.png" alt-text="Filter apps that use Azure AD Graph." border="true":::
 
-### Method 3: Use a PowerShell script
+### Method 4: Use a PowerShell script
 
 Download and run [this PowerShell script](https://github.com/microsoft/AzureADGraphApps). Use this method to retrieve apps with their home directory in your tenant and apps with their home directories in other tenants.