docs: avoid using nested mdx-code-block (#7543)

* docs: avoid using nested mdx-code-block

* fix

website/docs/blog.mdx

@@ -192,9 +192,10 @@ Use the `authors` front matter field to declare blog post authors. An author sho
 
 Blog post authors can be declared directly inside the front matter:
 
-````mdx-code-block
+```mdx-code-block
 <Tabs groupId="author-front-matter">
-  <TabItem value="single" label="Single author">
+<TabItem value="single" label="Single author">
+```
 
 ```md title="my-blog-post.md"
 ---
@@ -207,8 +208,10 @@ authors:
 ---
 ```
 
-  </TabItem>
-  <TabItem value="multiple" label="Multiple authors">
+```mdx-code-block
+</TabItem>
+<TabItem value="multiple" label="Multiple authors">
+```
 
 ```md title="my-blog-post.md"
 ---
@@ -225,9 +228,10 @@ authors:
 ---
 ```
 
-  </TabItem>
+```mdx-code-block
+</TabItem>
 </Tabs>
-````
+```
 
 :::tip
 
@@ -279,9 +283,10 @@ Use the `authorsMapPath` plugin option to configure the path. JSON is also suppo
 
 In blog posts front matter, you can reference the authors declared in the global configuration file:
 
-````mdx-code-block
+```mdx-code-block
 <Tabs groupId="author-front-matter">
-  <TabItem value="single" label="Single author">
+<TabItem value="single" label="Single author">
+```
 
 ```md title="my-blog-post.md"
 ---
@@ -289,8 +294,10 @@ authors: jmarcey
 ---
 ```
 
-  </TabItem>
-  <TabItem value="multiple" label="Multiple authors">
+```mdx-code-block
+</TabItem>
+<TabItem value="multiple" label="Multiple authors">
+```
 
 ```md title="my-blog-post.md"
 ---
@@ -298,9 +305,10 @@ authors: [jmarcey, slorber]
 ---
 ```
 
-  </TabItem>
+```mdx-code-block
+</TabItem>
 </Tabs>
-````
+```
 
 :::info
 
@@ -394,9 +402,10 @@ The default reading time is able to accept additional options: `wordsPerMinute`
 
 Use the callback for all your customization needs:
 
-````mdx-code-block
+```mdx-code-block
 <Tabs>
 <TabItem value="disable-per-post" label="Per-post disabling">
+```
 
 **Disable reading time on one page:**
 
@@ -410,7 +419,9 @@ module.exports = {
           showReadingTime: true,
           // highlight-start
           readingTime: ({content, frontMatter, defaultReadingTime}) =>
-            frontMatter.hide_reading_time ? undefined : defaultReadingTime({content}),
+            frontMatter.hide_reading_time
+              ? undefined
+              : defaultReadingTime({content}),
           // highlight-end
         },
       },
@@ -429,8 +440,10 @@ hide_reading_time: true
 This page will no longer display the reading time stats!
 ```
 
+```mdx-code-block
 </TabItem>
 <TabItem value="passing-options" label="Passing options">
+```
 
 **Pass options to the default reading time function:**
 
@@ -452,8 +465,10 @@ module.exports = {
 };
 ```
 
+```mdx-code-block
 </TabItem>
 <TabItem value="using-custom-algo" label="Using custom algorithms">
+```
 
 **Use a custom implementation of reading time:**
 
@@ -475,9 +490,10 @@ module.exports = {
 };
 ```
 
+```mdx-code-block
 </TabItem>
 </Tabs>
-````
+```
 
 :::