Update description

Author: wchen-r7

modules/exploits/multi/http/uptime_file_upload_1.rb

@@ -19,6 +19,10 @@ def initialize(info = {})
           This module exploits an arbitrary file upload vulnerability found within the Up.Time
           monitoring server 7.2 and below. A malicious entity can upload a PHP file into the
           webroot without authentication, leading to arbitrary code execution.
+
+          Although the vendor fixed Up.Time to prevent this vulnerability, it was not properly
+          mitigated. To exploit against a newer version of Up.Time (such as 7.4), please use
+          exploits/multi/http/uptime_file_upload_2.
       },
       'Author'         =>
         [