update docs

Author: ota-meshi

README.md

@@ -50,7 +50,7 @@ module.exports = {
  ],
  rules: {
  // override/add rules settings here, such as:
- // 'vue-scoped-css/no-warning-html-comments': 'error'
+ // 'vue-scoped-css/no-unused-selector': 'error'
  }
 }
 ```

docs/README.md

@@ -42,7 +42,7 @@ module.exports = {
  ],
  rules: {
  // override/add rules settings here, such as:
- // 'vue-scoped-css/no-warning-html-comments': 'error'
+ // 'vue-scoped-css/no-unused-selector': 'error'
  }
 }
 ```