Change a string literal in response headers

reference: http://msdn.microsoft.com/en-us/library/windowsphone/develop/ff941100%28v=vs.105%29.aspx#BKMK_PushNotificationServiceResponseCodes
I did some testing. After inspecting the actual response, it turned out that there is no space in the word 'TempDisconnected' unlike the one in the above document.