Fix typo in doc

docs/07.1-more-about-refs.md

@@ -39,7 +39,7 @@ Consider the case when you wish to tell an `<input />` element (that exists with
 ```
 
 
-Notice how, in this example, we want to "tell" the input something - something that it cannot infer from its props over time. In this case we want to "tell" it that it should now become focused. However, there are some challenges. What is returned from `render()`` is not your actual composition of "child" components, it is merely a *description* of the children at a particular instance in time - a snapshot, if you will.
+Notice how, in this example, we want to "tell" the input something - something that it cannot infer from its props over time. In this case we want to "tell" it that it should now become focused. However, there are some challenges. What is returned from `render()` is not your actual composition of "child" components, it is merely a *description* of the children at a particular instance in time - a snapshot, if you will.
 
 > Note:
 >