docs(api-plugin): add a missing parenthesis (#17751)

Author: shuuji3

docs/guide/api-plugin.md

@@ -400,7 +400,7 @@ Vite plugins can also provide hooks that serve Vite-specific purposes. These hoo
   ```
 
   ::: warning Note
-  This hook won't be called if you are using a framework that has custom handling of entry files (for example [SvelteKit](https://github.com/sveltejs/kit/discussions/8269#discussioncomment-4509145).
+  This hook won't be called if you are using a framework that has custom handling of entry files (for example [SvelteKit](https://github.com/sveltejs/kit/discussions/8269#discussioncomment-4509145)).
   :::
 
 ### `handleHotUpdate`