docs: use HTMLElement instead of DOM node

Author: eddyerburgh

docs/en/api/wrapper/README.md

@@ -7,9 +7,9 @@ A `Wrapper` is an object that contains a mounted component or vnode and methods
 - **Properties:**
 
 `vm` `Component`: this is the vue instance. You can access all the [instance methods and properties of a vm](https://vuejs.org/v2/api/#Instance-Properties) with `wrapper.vm`. This only exists on Vue component wrappers
-`element` `DOM node`: the root DOM node of the wrapper
+`element` `HTMLElement`: the root DOM node of the wrapper
 `options` `Object`: Object containing vue-test-utils options passed to `mount` or `shallow`
-`options.attachedToDom` `Boolean`: True if attachToDom was passed to `mount` or `shallow` 
+`options.attachedToDom` `Boolean`: True if attachToDom was passed to `mount` or `shallow`
 
 - **Methods:**