Change doc for boolean args

Author: wchen-r7

lib/msf/core/exploit/file_dropper.rb

@@ -102,8 +102,7 @@ def cleanup
   # See if +path+ exists on the remote system and is a regular file
   #
   # @param path [String] Remote filename to check
-  # @return [TrueClass] If the file exists
-  # @return [FalseClass] If the file doesn't exist
+  # @return [Boolean] True if the file exists, otherwise false.
   def file_dropper_file_exist?(session, path)
     if session.platform =~ /win/
       normalized = file_dropper_win_file(path)
@@ -134,8 +133,7 @@ def file_dropper_file_exist?(session, path)
   # Sends a file deletion command to the remote +session+
   #
   # @param [String] file The file to delete
-  # @return [TrueClass] the delete command has been executed in the remote machine
-  # @return [FalseClass] otherwise
+  # @return [Boolean] True if the delete command has been executed in the remote machine, otherwise false.
   def file_dropper_delete(session, file)
     win_file = file_dropper_win_file(file)
 
@@ -172,9 +170,7 @@ def file_dropper_delete(session, file)
   # Checks if a file has been deleted by the current job
   #
   # @param [String] file The file to check
-  # @param [TrueClass] exists_before Indicates if the file existed before the deletion
-  # @return [TrueClass] if the file has been deleted or it cannot resolve
-  # @return [FalseClass] if the file hasn't been deleted
+  # @return [Boolean] If the file has been deleted, otherwise false.
   def file_dropper_deleted?(session, file, exists_before)
     if exists_before  && file_dropper_file_exist?(session, file)
       print_error("Unable to delete #{file}")