update doc (#1147)

Author: ota-meshi

docs/rules/no-multiple-template-root.md

@@ -9,8 +9,9 @@ description: disallow adding multiple root nodes to the template
 
 - :gear: This rule is included in all of `"plugin:vue/essential"`, `"plugin:vue/strongly-recommended"` and `"plugin:vue/recommended"`.
 
-This rule checks whether template contains single root element valid for Vue 2.
+## :book: Rule Details
 
+This rule checks whether template contains single root element valid for Vue 2.
 
 <eslint-code-block :rules="{'vue/no-multiple-template-root': ['error']}">
 

lib/rules/require-explicit-emits.js

@@ -3,7 +3,6 @@
  * See LICENSE file in root directory for full license.
  */
 'use strict'
-// @ts-check
 
 /**
  * @typedef {import('vue-eslint-parser').AST.ESLintLiteral} Literal