Chore: fix rule no-unused-vars description

Author: 薛定谔的猫

lib/rules/no-unused-vars.js

@@ -1,5 +1,5 @@
 /**
- * @fileoverview warn variable definitions of v-for directives or scope attributes if those are not used.
+ * @fileoverview disallow unused variable definitions of v-for directives or scope attributes.
  * @author 薛定谔的猫<[email protected]>
  */
 'use strict'
@@ -37,7 +37,7 @@ module.exports = {
   create,
   meta: {
     docs: {
-      description: 'warn variable definitions of v-for directives or scope attributes if those are not used',
+      description: 'disallow unused variable definitions of v-for directives or scope attributes',
       category: 'Possible Errors',
       recommended: false
     },