update 'no doubt' to 'partly' to resolve vuejs#666

Author: chrisvfritz

src/v2/guide/instance.md

@@ -14,7 +14,7 @@ var vm = new Vue({
 })
 ```
 
-Although not strictly associated with the [MVVM pattern](https://en.wikipedia.org/wiki/Model_View_ViewModel), Vue's design was no doubt inspired by it. As a convention, we often use the variable `vm` (short for ViewModel) to refer to our Vue instances.
+Although not strictly associated with the [MVVM pattern](https://en.wikipedia.org/wiki/Model_View_ViewModel), Vue's design was partly inspired by it. As a convention, we often use the variable `vm` (short for ViewModel) to refer to our Vue instances.
 
 When you instantiate a Vue instance, you need to pass in an **options object** which can contain options for data, template, element to mount on, methods, lifecycle callbacks and more. The full list of options can be found in the [API reference](../api).