[rubygems/rubygems] Remove comment not adding much

https://github.com/rubygems/rubygems/commit/b3b5c2d379

lib/rubygems/requirement.rb

@@ -69,9 +69,6 @@ class Gem::Requirement
     end
   end
 
-  ##
-  # A default "version requirement" can surely _only_ be '>= 0'.
-
   def self.default
     new '>= 0'
   end