Proposed re-wording of description

[See rapid7#889]

Author: egypt

modules/exploits/unix/webapp/projectpier_upload_exec.rb

@@ -20,8 +20,9 @@ def initialize(info={})
 					This module exploits a vulnerability found in Project Pier.  The application's
 				uploading tool does not require any authentication, which allows a malicious user
 				to upload an arbitrary file onto the web server, and then cause remote code
-				execution by simply requesting it.  Please note this module only works best against
-				an Apache server due to the way it handle an extension name.
+				execution by simply requesting it. This module is known to work against Apache
+				servers due to the way it handles an extension name, but the vulnerability may
+				not be exploitable on others.
 			},
 			'License'        => MSF_LICENSE,
 			'Author'         =>