Removed reference to kbhit() which is no longer in the code

FreeRTOS/Demo/Posix_GCC/main.c

@@ -153,7 +153,6 @@ int main( void )
 		/* Start the trace recording - the recording is written to a file if
 		configASSERT() is called. */
 		printf( "\r\nTrace started.\r\nThe trace will be dumped to disk if a call to configASSERT() fails.\r\n" );
-		printf( "Uncomment the call to kbhit() in this file to also dump trace with a key press.\r\n" );
 		uiTraceStart();
 	}
 	#endif