Update admincp.phtml

ga-views/admincp.phtml

@@ -82,6 +82,7 @@
 				<ul>
 					<li>gitlab-ag will NOT delete the root user.</li>
 					<li>GitLab API may not return all users due to pagination. You may need to repeat the operation multiple times to ensure the task is fully completed.</li>
+					<li>To delete all users and groups, run <code>sudo gitlab-ctl remove_users</code> on your GitLab server.</li>
 				</ul>
 			</div>
 			<form class="form-horizontal">
@@ -206,4 +207,4 @@
 			<div class="page-header"><h2>Select Loggers</h2></div>
 		</section>
 	</div>
-
+