[rubygems/rubygems] Remove very old TODO note

It was added 10 years ago on a "146 additions, 170 deletions" commit
named "Deprecation removals and minor cleanup." that didn't explain much
other than that.

This TODO doesn't necessarily apply nowadays. I don't see how anyways.
TODO notes, if useful at all, should include a clear explanation of what
should be done either via the note itself or the commit message. This
note doens't meet any of these.

So I want to remove it because it distracts me every time I go through
it.

https://github.com/rubygems/rubygems/commit/58d81e8a32

lib/rubygems/specification.rb

@@ -1006,7 +1006,6 @@ class Gem::Specification < Gem::BasicSpecification
   # Return currently unresolved specs that contain the file matching +path+.
 
   def self.find_in_unresolved(path)
-    # TODO: do we need these?? Kill it
     specs = unresolved_deps.values.map {|dep| dep.to_specs }.flatten
 
     specs.find_all {|spec| spec.contains_requirable_file? path }