docs: update setData docs to reflect async mode

Author: AtofStryker

docs/api/wrapper/setData.md

@@ -16,7 +16,9 @@ setData works by recursively calling Vue.set.
 import { mount } from '@vue/test-utils'
 import Foo from './Foo.vue'
 
-const wrapper = mount(Foo)
-wrapper.setData({ foo: 'bar' })
-expect(wrapper.vm.foo).toBe('bar')
+test('setData demo', async () => {
+  const wrapper = mount(Foo)
+  await wrapper.setData({ foo: 'bar' })
+  expect(wrapper.vm.foo).toBe('bar')
+})
 ```

docs/ja/api/wrapper/setData.md

@@ -16,7 +16,9 @@ setData は再帰的に Vue.set を実行することで動作します。
 import { mount } from '@vue/test-utils'
 import Foo from './Foo.vue'
 
-const wrapper = mount(Foo)
-wrapper.setData({ foo: 'bar' })
-expect(wrapper.vm.foo).toBe('bar')
+test('setData demo', async () => {
+  const wrapper = mount(Foo)
+  await wrapper.setData({ foo: 'bar' })
+  expect(wrapper.vm.foo).toBe('bar')
+})
 ```

docs/ru/api/wrapper/setData.md

@@ -18,7 +18,9 @@ setData работает путём слияния существующих св
 import { mount } from '@vue/test-utils'
 import Foo from './Foo.vue'
 
-const wrapper = mount(Foo)
-wrapper.setData({ foo: 'bar' })
-expect(wrapper.vm.foo).toBe('bar')
+test('setData demo', async () => {
+  const wrapper = mount(Foo)
+  await wrapper.setData({ foo: 'bar' })
+  expect(wrapper.vm.foo).toBe('bar')
+})
 ```

docs/zh/api/wrapper/setData.md

@@ -16,7 +16,9 @@
 import { mount } from '@vue/test-utils'
 import Foo from './Foo.vue'
 
-const wrapper = mount(Foo)
-wrapper.setData({ foo: 'bar' })
-expect(wrapper.vm.foo).toBe('bar')
+test('setData demo', async () => {
+  const wrapper = mount(Foo)
+  await wrapper.setData({ foo: 'bar' })
+  expect(wrapper.vm.foo).toBe('bar')
+})
 ```