update wrong file path in documentation

docs/examples/en/math/convexhull/ConvexHull.html

@@ -213,7 +213,7 @@
 		<h2>Source</h2>
 
 		<p>
-			[link:https://github.com/mrdoob/three.js/blob/master/examples/jsm/math/ConvexHull.js examples/jsm/ConvexHull.js]
+			[link:https://github.com/mrdoob/three.js/blob/master/examples/jsm/math/ConvexHull.js examples/jsm/math/ConvexHull.js]
 		</p>
 	</body>
 </html>

docs/examples/zh/math/convexhull/ConvexHull.html

@@ -213,7 +213,7 @@
 		<h2>Source</h2>
 
 		<p>
-			[link:https://github.com/mrdoob/three.js/blob/master/examples/jsm/math/ConvexHull.js examples/jsm/ConvexHull.js]
+			[link:https://github.com/mrdoob/three.js/blob/master/examples/jsm/math/ConvexHull.js examples/jsm/math/ConvexHull.js]
 		</p>
 	</body>
 </html>