docs: vue2 example project runtime errors (#857)

Author: ilyaliao

examples/vite-vue2/package.json

@@ -7,7 +7,7 @@
     "dev": "cross-env DEBUG=unplugin-vue-components:* vite"
   },
   "dependencies": {
-    "vue": "^3.5.17"
+    "vue": "2.7.16"
   },
   "devDependencies": {
     "@vitejs/plugin-vue2": "^2.3.3",

examples/vue-cli/package.json

@@ -9,7 +9,7 @@
   "dependencies": {
     "@vue/composition-api": "^1.7.2",
     "core-js": "^3.43.0",
-    "vue": "^3.5.17"
+    "vue": "2.7.16"
   },
   "devDependencies": {
     "@vue/cli-plugin-babel": "^5.0.8",

examples/vue-cli/vue.config.js

@@ -1,6 +1,6 @@
-const IconsResolver = require('unplugin-icons/resolver')
-const Icons = require('unplugin-icons/webpack')
-const ScriptSetup = require('unplugin-vue2-script-setup/webpack')
+const IconsResolver = require('unplugin-icons/resolver').default
+const Icons = require('unplugin-icons/webpack').default
+const ScriptSetup = require('unplugin-vue2-script-setup/webpack').default
 const Components = require('unplugin-vue-components/webpack')
 
 /**