Docs: Accurately name function (#4060)

site/content/tutorial/02-reactivity/01-reactive-assignments/app-b/App.svelte

@@ -1,11 +1,11 @@
 <script>
 	let count = 0;
 
-	function handleClick() {
+	function incrementCount() {
 		count += 1;
 	}
 </script>
 
-<button on:click={handleClick}>
+<button on:click={incrementCount}>
 	Clicked {count} {count === 1 ? 'time' : 'times'}
 </button>

site/content/tutorial/02-reactivity/01-reactive-assignments/text.md

@@ -7,13 +7,13 @@ At the heart of Svelte is a powerful system of *reactivity* for keeping the DOM
 To demonstrate it, we first need to wire up an event handler. Replace line 9 with this:
 
 ```html
-<button on:click={handleClick}>
+<button on:click={incrementCount}>
 ```
 
-Inside the `handleClick` function, all we need to do is change the value of `count`:
+Inside the `incrementCount` function, all we need to do is change the value of `count`:
 
 ```js
-function handleClick() {
+function incrementCount() {
 	count += 1;
 }
 ```