Fix another typo

Author: wchen-r7

modules/exploits/windows/local/bypassuac_eventvwr.rb

@@ -37,7 +37,7 @@ def initialize(info={})
 
         The module does not require the architecture of the payload to match the OS. If
         specifying EXE::Custom your DLL should call ExitProcess() after starting your
-        payload in a seperate process.
+        payload in a separate process.
       },
       'License'       => MSF_LICENSE,
       'Author'        => [