Example webgl_gpgpu_water: Remove mention to orbiting the camera. (#21513)

* GPGPU Protoplanets example: fix pixel trails

* webgl_gpgpu_water.html: Remove mention to orbiting the camera.

examples/webgl_gpgpu_water.html

@@ -11,7 +11,7 @@
 		<div id="info">
 			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - <span id="waterSize"></span> webgl gpgpu water<br/>
 			Move mouse to disturb water.<br>
-			Press mouse button to orbit around. 'W' key toggles wireframe.
+			'W' key toggles wireframe.
 		</div>