Docs: update docs for ecmaVersion 2020 (#12120)

* update docs for ecmaVersion 2020

* fix first list

docs/user-guide/configuring.md

@@ -26,7 +26,7 @@ For ES6 syntax, use `{ "parserOptions": { "ecmaVersion": 6 } }`; for new ES6 glo
 { "es6": true } }`. `{ "env": { "es6": true } }` enables ES6 syntax automatically, but `{ "parserOptions": { "ecmaVersion": 6 } }` does not enable ES6 globals automatically.
 Parser options are set in your `.eslintrc.*` file by using the `parserOptions` property. The available options are:
 
-* `ecmaVersion` - set to 3, 5 (default), 6, 7, 8, 9, or 10 to specify the version of ECMAScript syntax you want to use. You can also set to 2015 (same as 6), 2016 (same as 7), 2017 (same as 8), 2018 (same as 9), or 2019 (same as 10) to use the year-based naming.
+* `ecmaVersion` - set to 3, 5 (default), 6, 7, 8, 9, 10 or 11 to specify the version of ECMAScript syntax you want to use. You can also set to 2015 (same as 6), 2016 (same as 7), 2017 (same as 8), 2018 (same as 9), 2019 (same as 10) or 2020 (same as 11) to use the year-based naming.
 * `sourceType` - set to `"script"` (default) or `"module"` if your code is in ECMAScript modules.
 * `ecmaFeatures` - an object indicating which additional language features you'd like to use:
     * `globalReturn` - allow `return` statements in the global scope