Update docs

docs/api/en/renderers/WebGLRenderer.html

@@ -335,7 +335,7 @@
 		<h3>[method:Float getClearAlpha]()</h3>
 		<p>Returns a [page:Float float] with the current clear alpha. Ranges from 0 to 1.</p>
 
-		<h3>[method:Color getClearColor]()</h3>
+		<h3>[method:Color getClearColor]( [param:Color target] )</h3>
 		<p>Returns a [page:Color THREE.Color] instance with the current clear color.</p>
 
 		<h3>[method:WebGLRenderingContext getContext]()</h3>

docs/api/zh/renderers/WebGLRenderer.html

@@ -322,7 +322,7 @@
 		<h3>[method:Float getClearAlpha]()</h3>
 		<p>返回一个表示当前alpha值的[page:Float float]，范围0到1</p>
 
-		<h3>[method:Color getClearColor]()</h3>
+		<h3>[method:Color getClearColor]( [param:Color target] )</h3>
 		<p>返回一个表示当前颜色值的[page:Color THREE.Color]实例</p>
 
 		<h3>[method:WebGLRenderingContext getContext]()</h3>