docs(app-invite): updated description

Author: ping-maxwell

apps/docs/content/docs/plugins/app-invite.mdx

@@ -12,6 +12,8 @@ The App Invite plugin enables you to invite users to your application through em
 - **Personal Invitations**: Targeted to specific email addresses, ensuring only the intended recipient can use the invitation
 - **Public Invitations**: Can be used by multiple users, making it ideal for open sign-up scenarios
 
+This plugin is particularly useful for invite-only applications.
+
 ## Installation
 
 <Steps>