[docs] simplify template literals to string primitives (#6806)

site/content/tutorial/02-reactivity/03-reactive-statements/app-b/App.svelte

@@ -2,7 +2,7 @@
 	let count = 0;
 
 	$: if (count >= 10) {
-		alert(`count is dangerously high!`);
+		alert('count is dangerously high!');
 		count = 9;
 	}
 

site/content/tutorial/02-reactivity/03-reactive-statements/text.md

@@ -5,15 +5,15 @@ title: Statements
 We're not limited to declaring reactive *values* — we can also run arbitrary *statements* reactively. For example, we can log the value of `count` whenever it changes:
 
 ```js
-$: console.log(`the count is ${count}`);
+$: console.log('the count is ' + count);
 ```
 
 You can easily group statements together with a block:
 
 ```js
 $: {
-	console.log(`the count is ${count}`);
-	alert(`I SAID THE COUNT IS ${count}`);
+	console.log('the count is ' + count);
+	alert('I SAID THE COUNT IS ' + count);
 }
 ```
 
@@ -21,7 +21,7 @@ You can even put the `$:` in front of things like `if` blocks:
 
 ```js
 $: if (count >= 10) {
-	alert(`count is dangerously high!`);
+	alert('count is dangerously high!');
 	count = 9;
 }
 ```