Grammatical error under prototypes section

Changed there is no "affect" to "effect"

Author: Asipita

get-started/ch3.md

@@ -256,7 +256,7 @@ homework.topic;
 // "JS" -- not "Math"
 ```
 
-The assignment to `topic` creates a property of that name directly on `otherHomework`; there's no affect on the `topic` property on `homework`. The next statement then accesses `otherHomework.topic`, and we see the non-delegated answer from that new property: `"Math"`.
+The assignment to `topic` creates a property of that name directly on `otherHomework`; there's no effect on the `topic` property on `homework`. The next statement then accesses `otherHomework.topic`, and we see the non-delegated answer from that new property: `"Math"`.
 
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