docs: updated (#1093)

Author: Jinjiang

Diff for: docs/zh/api/wrapper-array/filter.md

@@ -19,5 +19,5 @@ import Foo from './Foo.vue'
 
 const wrapper = shallowMount(Foo)
 const filteredDivArray = wrapper.findAll('div')
-  .filter(w => !w.classes('filtered'))
+  .filter(w => !w.hasClass('filtered'))
 ```

Diff for: docs/zh/guides/dom-events.md

@@ -158,7 +158,7 @@ describe('键盘事件测试', () => {
     expect(wrapper.vm.quantity).toBe(0)
   })
 
-  it('上按键将数量设置为 1', () => {
+  it('上按键将数量加 1', () => {
     const wrapper = mount(QuantityComponent)
     wrapper.trigger('keydown.up')
     expect(wrapper.vm.quantity).toBe(1)

Diff for: docs/zh/guides/using-with-vuex.md

@@ -276,7 +276,6 @@ export default {
     state.count++
   }
 }
-
 ```
 
 ```js
@@ -344,7 +343,8 @@ test('evenOrOdd returns odd if state.count is odd', () => {
 我们来写一个测试吧。当我们创建一个 store 时，我们会使用 `localVue` 来避免污染 Vue 的基础构造函数。该测试会使用 `store-config.js` 导出的配置创建一个 store：
 
 ```js
-// store-config.spec.js
+// store-config.js
+
 import mutations from './mutations'
 import getters from './getters'
 
@@ -358,6 +358,8 @@ export default {
 ```
 
 ```js
+// store-config.spec.js
+
 import { createLocalVue } from '@vue/test-utils'
 import Vuex from 'vuex'
 import storeConfig from './store-config'