docs: tweaks (vuejs#870)

Author: 38elements

Diff for: docs/api/createWrapper.md

@@ -1,11 +1,11 @@
-## createWrapper(node, options)
+## createWrapper(node [, options])
 
 - **Arguments:**
 
   - `{vm|HTMLElement} node`
   - `{Object} options`
     - `{Boolean} sync`
-    - `{Boolean} attachedToDocument
+    - `{Boolean} attachedToDocument`
 
 - **Returns:**
   - `{Wrapper}`

Diff for: docs/api/wrapper/setChecked.md

@@ -12,8 +12,8 @@ import { mount } from '@vue/test-utils'
 import Foo from './Foo.vue'
 
 const wrapper = mount(Foo)
-const option = wrapper.find('input[type="radio"]')
-option.setChecked()
+const radioInput = wrapper.find('input[type="radio"]')
+radioInput.setChecked()
 ```
 
 - **Note:**

Diff for: docs/api/wrapper/setValue.md

@@ -13,8 +13,8 @@ import Foo from './Foo.vue'
 
 const wrapper = mount(Foo)
 
-const input = wrapper.find('input[type="text"]')
-input.setValue('some value')
+const textInput = wrapper.find('input[type="text"]')
+textInput.setValue('some value')
 
 const select = wrapper.find('select')
 select.setValue('option value')