remove stray comment

Author: natikgadzhi

sentry-ruby/lib/sentry/transaction.rb

@@ -188,8 +188,6 @@ def set_initial_sample_decision(sampling_context:)
         return
       end
 
-      # This block would return either true / false (if parent was sampled or not)
-      # or the sample rate from the configuration, presumably between 0 and 1.
       sample_rate =
         if @traces_sampler.is_a?(Proc)
           @traces_sampler.call(sampling_context)