updating path to find api access in spfx readme (#832)

Author: vogtn

samples/sp-webpart/README.md

@@ -44,7 +44,7 @@ The admin of your tenant will need to approve the graph permissions in the admin
 
 3. Approve the permissions. Go to the SharePoint admin center (best reached via https://admin.microsoft.com > click **Show All** > SharePoint) and make sure you are signed in as admin.
 
-    Under *API Management* you should see the permissions that need to be approved. Approve each one by one.
+    Click on the *Advanced* menu, you should see *API access* which after clicking will show the page with permissions that need to be approved. Approve each one by one.
 
 You should now be able to test the webpart