doc: add comments to remaining exits

Signed-off-by: Varun Patil <radialapps@gmail.com>

lib/Controller/PublicController.php

@@ -213,7 +213,7 @@ class PublicController extends AuthPublicShareController
         header('HTTP/1.1 302 Found');
         header('Location: '.$url);
 
-        exit;
+        exit; // no other way to do this due to typing of super class
     }
 
     /** Get initial state of single item */

lib/Db/TimelineQuery.php

@@ -69,7 +69,7 @@ class TimelineQuery
         $sql = self::replaceQueryParams($query, $sql);
         echo "{$sql}";
 
-        exit;
+        exit; // only for debugging, so this is okay
     }
 
     public static function replaceQueryParams(IQueryBuilder &$query, string $sql)