CurvePath: Return `this` in `closePath()`. (#26697)

docs/api/ar/extras/core/CurvePath.html

@@ -36,7 +36,7 @@
 		<h3>[method:undefined add]( [param:Curve curve] )</h3>
 		<p>إضافة منحى إلى مصفوفة [page:.curves].</p>
 	 
-		<h3>[method:undefined closePath]()</h3>
+		<h3>[method:this closePath]()</h3>
 		<p>يضيف [page:LineCurve lineCurve] لإغلاق المسار.</p>
 	 
 		<h3>[method:Array getCurveLengths]()</h3>

docs/api/en/extras/core/CurvePath.html

@@ -36,7 +36,7 @@
 		<h3>[method:undefined add]( [param:Curve curve] )</h3>
 		<p>Add a curve to the [page:.curves] array.</p>
 
-		<h3>[method:undefined closePath]()</h3>
+		<h3>[method:this closePath]()</h3>
 		<p>Adds a [page:LineCurve lineCurve] to close the path.</p>
 
 		<h3>[method:Array getCurveLengths]()</h3>

docs/api/it/extras/core/CurvePath.html

@@ -38,7 +38,7 @@
 		<h3>[method:undefined add]( [param:Curve curve] )</h3>
 		<p>Aggiunge una curva all'array [page:.curves].</p>
 
-		<h3>[method:undefined closePath]()</h3>
+		<h3>[method:this closePath]()</h3>
 		<p>Aggiunge una [page:LineCurve lineCurve] per chiudere il percorso.</p>
 
 		<h3>[method:Array getCurveLengths]()</h3>

docs/api/ko/extras/core/CurvePath.html

@@ -37,7 +37,7 @@
 		<h3>[method:undefined add]( [param:Curve curve] )</h3>
 		<p>[page:.curves] 배열에 곡선을 추가합니다.</p>
 
-		<h3>[method:undefined closePath]()</h3>
+		<h3>[method:this closePath]()</h3>
 		<p>path를 닫기위해 [page:LineCurve lineCurve]를 추가합니다.</p>
 
 		<h3>[method:Array getCurveLengths]()</h3>

docs/api/zh/extras/core/CurvePath.html

@@ -45,7 +45,7 @@
 		<h3>[method:undefined add]( [param:Curve curve] )</h3>
 		<p>添加一条曲线到[page:.curves]数组中。</p>
 
-		<h3>[method:undefined closePath]()</h3>
+		<h3>[method:this closePath]()</h3>
 		<p>添加一条[page:LineCurve lineCurve]用于闭合路径。</p>
 
 		<h3>[method:Array getCurveLengths]()</h3>

src/extras/core/CurvePath.js

@@ -37,6 +37,8 @@ class CurvePath extends Curve {
 
 		}
 
+		return this;
+
 	}
 
 	// To get accurate point with reference to