fix documentation (#10039)

docs/api/core/BufferAttribute.html

@@ -54,7 +54,7 @@
 		A version number, incremented every time the needsUpdate property is set to true.
 		</div>
 
-		<h3>[property:Function onUploadCallback]</h3>
+		<h3>[property:Function onUpload]</h3>
 		<div>
 		A callback function that is executed after the Renderer has transfered the attribute array data to the GPU.
 		</div>