Docs: Improve InstancedBufferGeometry page. (#22152)

docs/api/en/core/InstancedBufferGeometry.html

@@ -31,6 +31,9 @@
 		<h2>Methods</h2>
 		<p>See [page:BufferGeometry] for inherited methods.</p>
 
+		<h3>[method:InstancedBufferGeometry copy]( [param:InstancedBufferGeometry source] )</h3>
+		<p>Copies the given [name] to this instance.</p>
+
 		<h2>Source</h2>
 
 		<p>

docs/api/zh/core/InstancedBufferGeometry.html

@@ -31,6 +31,9 @@
 		<h2>方法</h2>
 		<p>继承方法详见 [page:BufferGeometry]。</p>
 
+		<h3>[method:InstancedBufferGeometry copy]( [param:InstancedBufferGeometry source] )</h3>
+		<p>Copies the given [name] to this instance.</p>
+
 		<h2>源代码</h2>
 
 		<p>