Docs: Add AnimationUtils.makeClipAdditive(). (#22213)

docs/api/ar/animation/AnimationUtils.html

@@ -42,6 +42,11 @@
 		ترجاع *true* إذا كان الكائن مصفوفة مكتوبة (typed array.).
 		</p>
 
+		<h3>[method:AnimationClip makeClipAdditive]( [param:AnimationClip targetClip], [param:Number referenceFrame], [param:AnimationClip referenceClip], [param:Number fps] )</h3>
+		<p>
+		Converts the keyframes of the given animation clip to an additive format.
+		</p>
+
 		<h3>[method:Array sortedArray]( values, stride, order )</h3>
 		<p>
 		يفرز المصفوفة التي تم إرجاعها مسبقًا بناءا [page:AnimationUtils.getKeyframeOrder getKeyframeOrder].

docs/api/en/animation/AnimationUtils.html

@@ -42,6 +42,11 @@
 		Returns *true* if the object is a typed array.
 		</p>
 
+		<h3>[method:AnimationClip makeClipAdditive]( [param:AnimationClip targetClip], [param:Number referenceFrame], [param:AnimationClip referenceClip], [param:Number fps] )</h3>
+		<p>
+		Converts the keyframes of the given animation clip to an additive format.
+		</p>
+
 		<h3>[method:Array sortedArray]( values, stride, order )</h3>
 		<p>
 		Sorts the array previously returned by [page:AnimationUtils.getKeyframeOrder getKeyframeOrder].

docs/api/ko/animation/AnimationUtils.html

@@ -42,6 +42,11 @@
 		타입 배열이면 *true*를 리턴합니다.
 		</p>
 
+		<h3>[method:AnimationClip makeClipAdditive]( [param:AnimationClip targetClip], [param:Number referenceFrame], [param:AnimationClip referenceClip], [param:Number fps] )</h3>
+		<p>
+		Converts the keyframes of the given animation clip to an additive format.
+		</p>
+
 		<h3>[method:Array sortedArray]( values, stride, order )</h3>
 		<p>
 		이전에 [page:AnimationUtils.getKeyframeOrder getKeyframeOrder]를 통해 리턴된 배열을 정렬합니다.

docs/api/zh/animation/AnimationUtils.html

@@ -37,17 +37,16 @@
 		返回一个数组，时间和值可以根据此数组排序。
 		</p>
 
-		<h3>[method:Number insertKeyframe]( [param:KeyframeTrack track], [param:Number time] )</h3>
-		<p></p>
-
 		<h3>[method:Boolean isTypedArray]( object )</h3>
 		<p>
 		如果该对象是类型化数组，返回*true*
 
 		</p>
 
-		<h3>[method:AnimationClip mergeMorphTargetTracks]( [param:AnimationClip clip], [param:Object3D root] )</h3>
-		<p></p>
+		<h3>[method:AnimationClip makeClipAdditive]( [param:AnimationClip targetClip], [param:Number referenceFrame], [param:AnimationClip referenceClip], [param:Number fps] )</h3>
+		<p>
+		Converts the keyframes of the given animation clip to an additive format.
+		</p>
 
 		<h3>[method:Array sortedArray]( values, stride, order )</h3>
 		<p>