Update 7.custom-extension.md

Author: GautierDele

content/1.getting-started/7.custom-extension.md

@@ -9,7 +9,7 @@ You can easily create a customized Faker extension. To do so, simply define a PH
 ```php
 use Xefi\Faker\Extensions\Extension;
 
-class CustomExtension extends Extension
+class CustomEmailExtension extends Extension
 {
     public function generateRandomEmail(string $domainName): mixed
     {
@@ -21,7 +21,7 @@ class CustomExtension extends Extension
 
 You'll also need to load your extension into Faker
 ```php
-faker()->resolveExtensions([ExtensionsArray])
+faker()->resolveExtensions([CustomEmailExtension::class])
 ```