Update invite.mdx for managing invites (#79)

Co-authored-by: Dick Hardt <dickhardt@gmail.com>

pages/docs/apis/invite.mdx

@@ -100,8 +100,10 @@ You can let your users manage their outstanding invitations with your applicatio
 
 | Name                | Description                             |
 |---------------------|-----------------------------------------|
+| `inviter`           | The `sub` provided by Hellō of the inviter |
 | `client_id`         | Client ID associated with the app       |
 | `return_uri`        | The URI to return the inviter when they are done |
+| `manage=true`       | Flag to show management interface         |
 
 This is the invite request without the `inviter` and `initiate_login_uri` query parameters.