[docs] add rel noreferrer to fix warning in tutorial (#8024)

Co-authored-by: vaishnav <vaishnav240204@gmail.com>
Co-authored-by: Alfredo Vecino <fredovecino@gmail.com>
Co-authored-by: Yuichiro Yamashita <xydybaseball@gmail.com>

site/content/examples/09-transitions/06-deferred-transitions/App.svelte

@@ -56,8 +56,8 @@
 					>
 
 					<p class='credit'>
-						<a target="_blank" href="https://www.flickr.com/photos/{d.path}">via Flickr</a> &ndash;
-						<a target="_blank" href={d.license.url}>{d.license.name}</a>
+						<a target="_blank" rel="noreferrer" href="https://www.flickr.com/photos/{d.path}">via Flickr</a> &ndash;
+						<a target="_blank" rel="noreferrer" href={d.license.url}>{d.license.name}</a>
 					</p>
 				</div>
 			{/await}

site/content/examples/21-miscellaneous/01-hacker-news/Summary.svelte

@@ -13,7 +13,7 @@
 
 <article>
 	<span>{i + offset + 1}</span>
-	<h2><a target="_blank" href={url}>{item.title}</a></h2>
+	<h2><a target="_blank" rel="noreferrer" href={url}>{item.title}</a></h2>
 	<p class="meta"><a href="#/item/{item.id}">{comment_text()}</a> by {item.user} {item.time_ago}</p>
 </article>
 
@@ -37,4 +37,4 @@
 	a {
 		color: #333;
 	}
-</style>
+</style>

site/content/tutorial/04-logic/04-each-blocks/app-a/App.svelte

@@ -10,7 +10,7 @@
 
 <ul>
 	<!-- open each block -->
-		<li><a target="_blank" href="https://www.youtube.com/watch?v={cat.id}">
+		<li><a target="_blank" href="https://www.youtube.com/watch?v={cat.id}" rel="noreferrer">
 			{cat.name}
 		</a></li>
 	<!-- close each block -->

site/content/tutorial/04-logic/04-each-blocks/app-b/App.svelte

@@ -10,7 +10,7 @@
 
 <ul>
 	{#each cats as { id, name }, i}
-		<li><a target="_blank" href="https://www.youtube.com/watch?v={id}">
+		<li><a target="_blank" href="https://www.youtube.com/watch?v={id}" rel="noreferrer">
 			{i + 1}: {name}
 		</a></li>
 	{/each}

site/content/tutorial/04-logic/04-each-blocks/text.md

@@ -7,7 +7,7 @@ If you need to loop over lists of data, use an `each` block:
 ```html
 <ul>
 	{#each cats as cat}
-		<li><a target="_blank" href="https://www.youtube.com/watch?v={cat.id}">
+		<li><a target="_blank" href="https://www.youtube.com/watch?v={cat.id}" rel="noreferrer">
 			{cat.name}
 		</a></li>
 	{/each}
@@ -20,10 +20,10 @@ You can get the current *index* as a second argument, like so:
 
 ```html
 {#each cats as cat, i}
-	<li><a target="_blank" href="https://www.youtube.com/watch?v={cat.id}">
+	<li><a target="_blank" href="https://www.youtube.com/watch?v={cat.id}" rel="noreferrer">
 		{i + 1}: {cat.name}
 	</a></li>
 {/each}
 ```
 
-If you prefer, you can use destructuring — `each cats as { id, name }` — and replace `cat.id` and `cat.name` with `id` and `name`.
+If you prefer, you can use destructuring — `each cats as { id, name }` — and replace `cat.id` and `cat.name` with `id` and `name`.