Update LOD documents

docs/api/en/objects/LOD.html

@@ -72,7 +72,7 @@ scene.add( lod );
 		<h2>Methods</h2>
 		<p>See the base [page:Object3D] class for common methods.</p>
 
-		<h3>[method:LOD addLevel]( [param:Object3D object], [param:Float distance] )</h3>
+		<h3>[method:this addLevel]( [param:Object3D object], [param:Float distance] )</h3>
 		<p>
 		[page:Object3D object] - The [page:Object3D] to display at this level.<br />
 		[page:Float distance] - The distance at which to display this level of detail.<br /><br />

docs/api/zh/objects/LOD.html

@@ -69,7 +69,7 @@ scene.add( lod );
 		<h2>方法</h2>
 		<p>请参阅其基类[page:Object3D]来查看共有方法。</p>
 
-		<h3>[method:LOD addLevel]( [param:Object3D object], [param:Float distance] )</h3>
+		<h3>[method:this addLevel]( [param:Object3D object], [param:Float distance] )</h3>
 		<p>
 		[page:Object3D object] —— 在这个层次中将要显示的[page:Object3D]。<br />
 		[page:Float distance] —— 将显示这一细节层次的距离。<br /><br />