Fix php 8 error

htdocs/adherents/document.php

@@ -80,7 +80,7 @@ if ($id > 0 || !empty($ref)) {
 	// Define variables to know what current user can do on properties of user linked to edited member
 	if ($object->user_id) {
 		// $User is the user who edits, $object->user_id is the id of the related user in the edited member
-		$caneditfielduser = ((($user->id == $object->user_id) && $$user->hasRight('user', 'self', 'creer'))
+		$caneditfielduser = ((($user->id == $object->user_id) && $user->hasRight('user', 'self', 'creer'))
 			|| (($user->id != $object->user_id) && $user->hasRight('user', 'user', 'creer')));
 		$caneditpassworduser = ((($user->id == $object->user_id) && $user->hasRight('user', 'self', 'password'))
 			|| (($user->id != $object->user_id) && $user->hasRight('user', 'user', 'password')));