Remove off-topic comment from JsDuck::Tag::Aside.

lib/jsduck/tag/aside.rb

@@ -3,9 +3,6 @@ require "jsduck/logger"
 
 module JsDuck::Tag
   # Implementation of @aside tag.
-  #
-  # To document members that were present in previous version but are
-  # completely gone now.  Other than that it behaves exactly like @deprecated.
   class Aside < JsDuck::MetaTag
     def initialize
       @name = "aside"