Docs: Add Skeleton.dispose().

docs/api/en/objects/Skeleton.html

@@ -110,6 +110,11 @@
 		Searches through the skeleton's bone array and returns the first with a matching name.<br />
 		</p>
 
+		<h3>[method:null dispose]()</h3>
+		<p>
+		Can be used if an instance of [name] becomes obsolete in an application. The method will free internal resources.
+		</p>
+
 		<h2>Source</h2>
 
 		<p>

docs/api/zh/objects/Skeleton.html

@@ -108,6 +108,11 @@
 		在骨架中的骨骼数组中遍览，并返回第一个能够和name匹配上的骨骼对象。<br />
 		</p>
 
+		<h3>[method:null dispose]()</h3>
+		<p>
+		Can be used if an instance of [name] becomes obsolete in an application. The method will free internal resources.
+		</p>
+
 		<h2>源代码</h2>
 
 		<p>