Merge pull request #258 from jasonwbarnett/fix-installed-app-example

updated example so that it works and is more relevant to the new api

lib/google/api_client/auth/installed_app.rb

@@ -23,13 +23,15 @@ module Google
     #
     # @example
     #
-    #    client = Google::APIClient.new
     #    flow = Google::APIClient::InstalledAppFlow.new(
     #      :client_id => '691380668085.apps.googleusercontent.com',
     #      :client_secret => '...',
     #      :scope => 'https://www.googleapis.com/auth/drive'
     #    )
-    #    client.authorization = flow.authorize
+    #    authorization = flow.authorize
+    #    Drive = Google::Apis::DriveV2
+    #    drive = Drive::DriveService.new
+    #    drive.authorization = authorization
     #
     class InstalledAppFlow