[docs] Rename a variable count_value to countValue in the Stores section (#7180)

Author: nazar-lazarchuk

site/content/examples/07-stores/00-writable-stores/App.svelte

@@ -4,14 +4,14 @@
 	import Decrementer from './Decrementer.svelte';
 	import Resetter from './Resetter.svelte';
 
-	let count_value;
+	let countValue;
 
 	const unsubscribe = count.subscribe(value => {
-		count_value = value;
+		countValue = value;
 	});
 </script>
 
-<h1>The count is {count_value}</h1>
+<h1>The count is {countValue}</h1>
 
 <Incrementer/>
 <Decrementer/>

site/content/tutorial/08-stores/01-writable-stores/app-a/App.svelte

@@ -4,14 +4,14 @@
 	import Decrementer from './Decrementer.svelte';
 	import Resetter from './Resetter.svelte';
 
-	let count_value;
+	let countValue;
 
 	count.subscribe(value => {
-		count_value = value;
+		countValue = value;
 	});
 </script>
 
-<h1>The count is {count_value}</h1>
+<h1>The count is {countValue}</h1>
 
 <Incrementer/>
 <Decrementer/>

site/content/tutorial/08-stores/01-writable-stores/app-b/App.svelte

@@ -4,14 +4,14 @@
 	import Decrementer from './Decrementer.svelte';
 	import Resetter from './Resetter.svelte';
 
-	let count_value;
+	let countValue;
 
 	count.subscribe(value => {
-		count_value = value;
+		countValue = value;
 	});
 </script>
 
-<h1>The count is {count_value}</h1>
+<h1>The count is {countValue}</h1>
 
 <Incrementer/>
 <Decrementer/>

site/content/tutorial/08-stores/01-writable-stores/text.md

@@ -4,7 +4,7 @@ title: Writable stores
 
 Not all application state belongs inside your application's component hierarchy. Sometimes, you'll have values that need to be accessed by multiple unrelated components, or by a regular JavaScript module.
 
-In Svelte, we do this with *stores*. A store is simply an object with a `subscribe` method that allows interested parties to be notified whenever the store value changes. In `App.svelte`, `count` is a store, and we're setting `count_value` in the `count.subscribe` callback.
+In Svelte, we do this with *stores*. A store is simply an object with a `subscribe` method that allows interested parties to be notified whenever the store value changes. In `App.svelte`, `count` is a store, and we're setting `countValue` in the `count.subscribe` callback.
 
 Click the `stores.js` tab to see the definition of `count`. It's a *writable* store, which means it has `set` and `update` methods in addition to `subscribe`.
 

site/content/tutorial/08-stores/02-auto-subscriptions/app-a/App.svelte

@@ -4,14 +4,14 @@
 	import Decrementer from './Decrementer.svelte';
 	import Resetter from './Resetter.svelte';
 
-	let count_value;
+	let countValue;
 
 	count.subscribe(value => {
-		count_value = value;
+		countValue = value;
 	});
 </script>
 
-<h1>The count is {count_value}</h1>
+<h1>The count is {countValue}</h1>
 
 <Incrementer/>
 <Decrementer/>

site/content/tutorial/08-stores/02-auto-subscriptions/text.md

@@ -8,7 +8,7 @@ Start by declaring `unsubscribe` in `App.svelte`:
 
 ```js
 const unsubscribe = count.subscribe(value => {
-	count_value = value;
+	countValue = value;
 });
 ```
 > Calling a `subscribe` method returns an `unsubscribe` function.
@@ -23,16 +23,16 @@ You now declared `unsubscribe`, but it still needs to be called, for example thr
 	import Decrementer from './Decrementer.svelte';
 	import Resetter from './Resetter.svelte';
 
-	let count_value;
+	let countValue;
 
 	const unsubscribe = count.subscribe(value => {
-		count_value = value;
+		countValue = value;
 	});
 
 	onDestroy(unsubscribe);
 </script>
 
-<h1>The count is {count_value}</h1>
+<h1>The count is {countValue}</h1>
 ```
 
 It starts to get a bit boilerplatey though, especially if your component subscribes to multiple stores. Instead, Svelte has a trick up its sleeve — you can reference a store value by prefixing the store name with `$`: