fix: export missing createCommentVNode fn

packages/runtime-core/src/index.ts

@@ -49,7 +49,7 @@ export { toString } from './helpers/toString'
 export { toHandlers } from './helpers/toHandlers'
 export { renderSlot } from './helpers/renderSlot'
 export { createSlots } from './helpers/createSlots'
-export { setBlockTracking, createTextVNode } from './vnode'
+export { setBlockTracking, createTextVNode, createCommentVNode } from './vnode'
 export { capitalize, camelize } from '@vue/shared'
 
 // Internal, for integration with runtime compiler