MeshSurfaceSampler: Clean up docs.

docs/examples/en/math/MeshSurfaceSampler.html

@@ -17,7 +17,7 @@
 		<h2>Example</h2>
 
 		<code>
-		// Create a sampler for a non-indexed BufferGeometry surface.
+		// Create a sampler for a BufferGeometry surface.
 		var sampler = new THREE.MeshSurfaceSampler( surfaceGeometry )
 			.setWeightAttribute( 'color' )
 			.build();

docs/examples/zh/math/MeshSurfaceSampler.html

@@ -17,7 +17,7 @@
 		<h2>Example</h2>
 
 		<code>
-		// Create a sampler for a non-indexed BufferGeometry surface.
+		// Create a sampler for a BufferGeometry surface.
 		var sampler = new THREE.MeshSurfaceSampler( surfaceGeometry )
 			.setWeightAttribute( 'color' )
 			.build();