feat: update comment and readme

Author: ChuChencheng

README.md

@@ -59,7 +59,7 @@ npm install @wsfe/vue-tree
 
 ```typescript
 // 大家可以根据需要是否引入VTreeNode, VTreeSearch, VTreeDrop
-import Vtree, { VTreeNode, VTreeSearch, VTreeDrop } from '@wsfe/vue-tree'
+import VTree, { VTreeNode, VTreeSearch, VTreeDrop } from '@wsfe/vue-tree'
 import '@wsfe/vue-tree/style.css'
 ```
 

src/store/tree-store.ts

@@ -872,7 +872,7 @@ export default class TreeStore extends TreeEventTarget {
     )
     this.insertIntoFlatData(flatIndex, nodes)
 
-    // 更新被移除处父节点状态
+    // 更新插入节点父节点状态
     this.updateMovingNodeStatus(node)
   }