Make it YARD compliant documentation

Author: jvazquez-r7

lib/msf/core/post/file.rb

@@ -31,9 +31,9 @@ def pwd
     end
   end
 
-  #
-  # Returns a list of the contents of the specified +directory+
-  #
+  # Returns a list of the contents of the specified directory
+  # @param directory [String] the directory to list
+  # @return [Array] the contents of the directory
   def dir(directory = nil)
     if session.type == 'meterpreter'
       return session.fs.dir.entries(directory)