update doc

Author: ota-meshi

docs/user-guide/README.md

@@ -359,20 +359,22 @@ module.exports = {
 
 ##### Using ESLint <= v7.x
 
-The parser `espree` that comes with `ESLint` doesn't understand the syntax of ES2022, so it can't parse Top Level `await` either.  
-However, the `vue-eslint-parser` used by `eslint-plugin-vue` can use `espree` v8, which understands ES2022 by configuration.
+The parser `espree` that comes with `ESLint` v7.x doesn't understand the syntax of ES2022, so it can't parse the Top Level `await` either.  
+However, `espree` v8+ can understand the syntax of ES2022 and parse the Top Level `await`.  
+You install `espree` v8+ and specify `"espree"` and ES2022 in your configuration, the parser will be able to parse it.
 
 ```js
 module.exports = {
   parser: 'vue-eslint-parser',
   parserOptions: {
-    ecmaVersion: 2022, // If you specify 2022, espree >= v8.x will be used automatically.
+    parser: 'espree', // <-
+    ecmaVersion: 2022, // <-
     sourceType: 'module'
   },
 }
 ```
 
-However, note that the AST generated by `espree` v8 may not work well with some rules of `ESLint` v7.
+However, note that the AST generated by `espree` v8+ may not work well with some rules of `ESLint` v7.x.
 
 <!--
 ##### Using ESLint >= v8.x