doc: update big-data demo

Author: tangjinzhou

components/select/__tests__/__snapshots__/demo.test.js.snap

@@ -93,7 +93,7 @@ exports[`renders ./components/select/demo/basic.vue correctly 1`] = `
 `;
 
 exports[`renders ./components/select/demo/big-data.vue correctly 1`] = `
-<h2>10000 Items</h2>
+<h2>100000 Items</h2>
 <div style="width: 100%;" class="ant-select ant-select-multiple ant-select-show-search">
   <!---->
   <!---->

components/select/demo/big-data.vue

@@ -29,7 +29,7 @@ Select use virtual scroll which get better performance than 1.x
 <script lang="ts">
 import { defineComponent, reactive } from 'vue';
 const options: { value: string; disabled: boolean }[] = [];
-for (let i = 0; i < 10000; i++) {
+for (let i = 0; i < 100000; i++) {
   const value = `${i.toString(36)}${i}`;
   options.push({
     value,