docs: update doxs for the email-invite

Author: yaroslav8765

adminforth/documentation/docs/tutorial/07-Plugins/16-email-invite.md

@@ -184,7 +184,7 @@ Then, in the adapter options, add:
 
 ``` ts
 //diff-add
-import EmailAdapterMailgun from "../../adapters/adminforth-email-adapter-mailgun";
+import EmailAdapterMailgun from "@adminforth/adminforth-email-adapter-mailgun";
 
 ...