Update use-aadhttpclient.md

removed the "Access to the Microsoft Graph" section with the user_impersonation mention as MS Graph doesn't provide that anymore

Author: lucabandMSFT

docs/spfx/use-aadhttpclient.md

@@ -385,6 +385,3 @@ All permissions granted through web API requests are stored with the **SharePoin
 
 The service principal can be re-enabled by using the `Enable-SPOTenantServicePrincipal` cmdlet. Alternatively, it's also possible to enable and disable the **SharePoint Online Client Extensibility** service principal through the Office 365 CLI by using the [spo serviceprincipal set](https://pnp.github.io/office365-cli/cmd/spo/serviceprincipal/serviceprincipal-set/) command.
 
-### Access to the Microsoft Graph
-
-Even if you don't explicitly grant access to the Microsoft Graph, solutions are able to request an access token for it. The **SharePoint Online Client Extensibility** service principal issues an access token with the `user_impersonation` scope, which allows scripts to access basic information about the current user.