docs: updated gitlabHandler URL for new installations

Author: yashshanker

docs/platforms/gitlab-com.mdx

@@ -131,7 +131,7 @@ You can confirm the correct user is being selected by verifying the user ID show
 	/>
 </div>
 
-The webhook `https://coderabbit.ai/gitlabHandler` will now be installed for the projects selected.
+The webhook `https://app.coderabbit.ai/gitlabHandler` will now be installed for the projects selected.
 
 <div class="center-image">
 	<img