[rubygems/rubygems] Remove unnecessary comment

https://github.com/rubygems/rubygems/commit/ef4e5c6169

spec/bundler/install/gemfile/git_spec.rb

@@ -418,9 +418,6 @@ RSpec.describe "bundle install with git sources" do
 
   describe "when specifying local override" do
     it "uses the local repository instead of checking a new one out" do
-      # We don't generate it because we actually don't need it
-      # build_git "rack", "0.8"
-
       build_git "rack", "0.8", :path => lib_path("local-rack") do |s|
         s.write "lib/rack.rb", "puts :LOCAL"
       end