Nginx: Fix typo in vhosts templates.

http/Provision/Config/Nginx/Ssl/vhost_ssl_disabled.tpl.php

@@ -12,7 +12,7 @@ server {
   ssl_prefer_server_ciphers  on;
   keepalive_timeout          70;
   return                     404;
-  ### Dont't reveal Aegir front-end URL here.
+  ### Do not reveal Aegir front-end URL here.
 }
 
 <?php endif; ?>

http/Provision/Config/Nginx/subdir_disabled.tpl.php

 location ^~ /<?php print $subdir; ?>/ {
   return       404;
-  ### Dont't reveal Aegir front-end URL here.
+  ### Do not reveal Aegir front-end URL here.
 }

http/Provision/Config/Nginx/vhost_disabled.tpl.php

@@ -2,5 +2,5 @@ server {
   listen       *:<?php print $http_port; ?>;
   server_name  <?php print $this->uri . ' ' . implode(' ', $this->aliases); ?>;
   return       404;
-  ### Dont't reveal Aegir front-end URL here.
+  ### Do not reveal Aegir front-end URL here.
 }