Fix minor grammar issue in tutorial-tic-tac-toe.md (a to an) (#7136)

Author: FarisPalayi

src/content/learn/tutorial-tic-tac-toe.md

@@ -1133,7 +1133,7 @@ Calling the `setSquares` function lets React know the state of the component has
 
 <Note>
 
-JavaScript supports [closures](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Closures) which means an inner function (e.g. `handleClick`) has access to variables and functions defined in a outer function (e.g. `Board`). The `handleClick` function can read the `squares` state and call the `setSquares` method because they are both defined inside of the `Board` function.
+JavaScript supports [closures](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Closures) which means an inner function (e.g. `handleClick`) has access to variables and functions defined in an outer function (e.g. `Board`). The `handleClick` function can read the `squares` state and call the `setSquares` method because they are both defined inside of the `Board` function.
 
 </Note>