Document why we do not need to wait for child process to exit (waitpid)

Author: benoittgt

lib/rspec/core/bisect/fork_runner.rb

@@ -92,6 +92,10 @@ def initialize(runner, channel)
 
           def dispatch_specs(run_descriptor)
             fork { run_specs(run_descriptor) }
+            # We don't wait anymore that the subprocess is done with a waitpid
+            # because there is no need to. On OSX and Linux, with more than
+            # 1548 tests we were filling-up the pipe and saturating it. This
+            # ended up with stuck bisect command.
           end
 
         private