docs: Fix filepath typo. (#2826)

docs/docs/guides/developer-guide/plugins/index.mdx

@@ -189,7 +189,7 @@ We'll start by creating a new directory to house our plugin, add create the main
             ├── wishlist.plugin.ts
 ```
 
-```ts title="src/plugins/reviews-plugin/wishlist.plugin.ts"
+```ts title="src/plugins/wishlist-plugin/wishlist.plugin.ts"
 import { PluginCommonModule, VendurePlugin } from '@vendure/core';
 
 @VendurePlugin({