fix leftover todo in js/insecure-temporary-file

Author: erik-krogh

javascript/ql/src/Security/CWE-377/InsecureTemporaryFile.ql

@@ -1,6 +1,7 @@
 /**
  * @name Insecure temporary file
- * @description Creating a temporary file that is accessible by other users TODO:
+ * @description Creating a temporary file that is accessible by other users can
+ * lead to information disclosure and sometimes remote code execution.
  * @kind path-problem
  * @id js/insecure-temporary-file
  * @problem.severity warning