Merge pull request #205 from SERVANT14/patch-5

Tiny grammar fix

Author: yyx990803

src/guide/overview.md

@@ -88,7 +88,7 @@ var exampleVM2 = new Vue({
 </script>
 {% endraw %}
 
-Here we are encountering something new. The `v-if` attribute you are seeing are called **Directives**. Directives are prefixed with `v-` to indicate that they are special attributes provided by Vue.js, and as you may have guessed, they apply special reactive behavior to the rendered DOM. Go ahead and set `exampleVM2.greeting` to `false` in the console. You should see the "Hello!" message disappear.
+Here we are encountering something new. The `v-if` attribute you are seeing is called a **Directive**. Directives are prefixed with `v-` to indicate that they are special attributes provided by Vue.js, and as you may have guessed, they apply special reactive behavior to the rendered DOM. Go ahead and set `exampleVM2.greeting` to `false` in the console. You should see the "Hello!" message disappear.
 
 This second example demonstrates that not only can we bind DOM text to the data, we can also bind the **structure** of the DOM to the data. Moreover, Vue.js also provides a powerful transition effect system that can automatically apply transition effects when elements are inserted/removed by Vue.