samples: Updated copyright header

Change-Id: I821f514ced5e34d492cb167b65d7273e26ed7b84

samples/0_Intro/square/square.hipref.cpp

@@ -19,6 +19,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 */
+
 #include <stdio.h>
 #include "hip/hip_runtime.h"