Update effects.mdx (#819)

Author: YSternlicht

src/routes/concepts/effects.mdx

@@ -96,7 +96,7 @@ This means that the order of execution of effects is *not guaranteed* and should
 ### Nested effects
 
 When working with effects, it is possible to nest them within each other.
-This allows each effect to independently track its own dependencies, without affect the effect that it is nested within.
+This allows each effect to independently track its own dependencies, without affecting the effect that it is nested within.
 
 ```jsx
 createEffect(() => {
@@ -118,7 +118,7 @@ const [count, setCount] = createSignal(0);
 
 createEffect(() => {
 	console.log("Outer effect starts");
-	createEffect(() => console.log(count())); // when count changes, only the this effect will run
+	createEffect(() => console.log(count())); // when count changes, only this effect will run
 	console.log("Outer effect ends");
 });
 ```