Merge pull request facebook#1812 from baddox/patch-1

Add possessive to fix grammar

Author: sophiebits

docs/docs/ref-08-reconciliation.md

@@ -6,7 +6,7 @@ permalink: reconciliation.html
 prev: special-non-dom-attributes.html
 ---
 
-React key design decision is to make the API seem like it re-renders the whole app on every update. This makes writing applications a lot easier but is also an incredible challenge to make it tractable. This article explains how with powerful heuristics we managed to turn a O(n<sup>3</sup>) problem into a O(n) one.
+React's key design decision is to make the API seem like it re-renders the whole app on every update. This makes writing applications a lot easier but is also an incredible challenge to make it tractable. This article explains how with powerful heuristics we managed to turn a O(n<sup>3</sup>) problem into a O(n) one.
 
 
 ## Motivation