Samples: remove unnesassary hint.

examples/webgl_postprocessing_glitch.html

@@ -17,8 +17,6 @@
 			<h3>Photosensitive Epilepsy Warning</h3>
 			<p class="warning">
 				This demo contains strong and frequent flashes which may trigger a potential <strong>Photosensitive Epilepsy.</strong>
-				<br/>
-				If you got any uncomfortable, press <strong>Ctrl + W</strong> or <strong>Command + W</strong> to close this page.
 			</p>
 			<button id="startButton">Play</button>
 		</div>