Docs: Improve "How to update things" guide.

docs/manual/en/introduction/How-to-update-things.html

@@ -112,10 +112,11 @@ line.geometry.attributes.position.needsUpdate = true; // required after the firs
 			</code>
 
 			<p>
-				If you change the position data values after the initial render, you may need to
-				call `.computeBoundingSphere()` in order to recalculate the geometry's bounding sphere.
+				If you change the position data values after the initial render, you may need to recompute
+				bounding volumes so other features of the engine like view frustum culling or helpers properly work.
 			</p>
 			<code>
+line.geometry.computeBoundingBox();
 line.geometry.computeBoundingSphere();
 			</code>