Fix a typo in a sample code

Signed-off-by: Michał Kowalczyk <mkow@invisiblethingslab.com>

SampleCode/LocalAttestation/App/App.cpp

@@ -118,7 +118,7 @@ int _tmain(int argc, _TCHAR* argv[])
         printf("\nLoad Enclave Failure");
     }
 
-    printf("\nAvaliable Enclaves");
+    printf("\nAvailable Enclaves");
     printf("\nEnclave1 - EnclaveID %" PRIx64, e1_enclave_id);
     printf("\nEnclave2 - EnclaveID %" PRIx64, e2_enclave_id);
     printf("\nEnclave3 - EnclaveID %" PRIx64, e3_enclave_id);