perf: improve the usage documentation of vben-vxe-table (#4829)

* perf: improve the usage documentation of vben-vxe-table

docs/src/demos/vben-vxe-table/fixed/index.vue

@@ -1,10 +1,10 @@
 <script lang="ts" setup>
-import type { UseVbenVxeGrid, VxeGridProps } from '#/adapter/vxe-table';
-
-import { inject } from 'vue';
+import type { VxeGridProps } from '#/adapter/vxe-table';
 
 import { Button } from 'ant-design-vue';
 
+import { useVbenVxeGrid } from '#/adapter/vxe-table';
+
 import { getExampleTableApi } from '../mock-api';
 
 interface RowType {
@@ -16,10 +16,6 @@ interface RowType {
   releaseDate: string;
 }
 
-const useVbenVxeGrid = inject<UseVbenVxeGrid>(
-  'useVbenVxeGrid',
-) as UseVbenVxeGrid;
-
 const gridOptions: VxeGridProps<RowType> = {
   columns: [
     { fixed: 'left', title: '序号', type: 'seq', width: 50 },