Small typo fix

Author: tusharkhatiwada

content/docs/hooks-faq.md

@@ -109,7 +109,7 @@ There are a few more heuristics, and they might change over time as we fine-tune
 
 ### How do lifecycle methods correspond to Hooks?
 
-* `constructor`: Function components don't need a constructor. You can initialize the state in the [`useState`](/docs/hooks-reference.html#usestate) call. If computing it is expensive, you can pass a function to `useState`.
+* `constructor`: Function components don't need a constructor. You can initialize the state in the [`useState`](/docs/hooks-reference.html#usestate) call. If computing is expensive, you can pass a function to `useState`.
 
 * `getDerivedStateFromProps`: Schedule an update [while rendering](#how-do-i-implement-getderivedstatefromprops) instead.