[nit] Spelling errors in sample code comments

[betorr]

DeviceProfileSample/Program.cs and ManagedClientConsoleAppSample/Program.cs have the following code:

// check to see if we have a succesfull respond
if (response.IsSuccessStatusCode)
{
    Console.WriteLine("\tSuccesful REST call");

Which should be:

// check to see if we have a successful respond
if (response.IsSuccessStatusCode)
{
    Console.WriteLine("\tSuccessful REST call");