Update 10.6-update.md

Spelling fix.

docs/10.6-update.md

@@ -20,7 +20,7 @@ myData.x.y.z = 7;
 myData.a.b.push(9);
 ```
 
-you have no way of determining which data has changed since the previous copy is overriden. Instead, you need to create a new copy of `myData` and change only the parts of it that need to be changed. Then you can compare the old copy of `myData` with the new one in `shouldComponentUpdate()` using triple-equals:
+you have no way of determining which data has changed since the previous copy is overridden. Instead, you need to create a new copy of `myData` and change only the parts of it that need to be changed. Then you can compare the old copy of `myData` with the new one in `shouldComponentUpdate()` using triple-equals:
 
 ```js
 var newData = deepCopy(myData);