RUBY-659 modify comment to reference handling code

Author: TylerBrock

lib/mongo/networking.rb

@@ -208,7 +208,7 @@ def check_response_flags(flags)
         raise Mongo::OperationFailure, "Query response returned CURSOR_NOT_FOUND. " +
           "Either an invalid cursor was specified, or the cursor may have timed out on the server."
       elsif flags & Mongo::Constants::REPLY_QUERY_FAILURE != 0
-        # Getting odd failures when a exception is raised here.
+        # Mongo query reply failures are handled in Cursor#next.
       end
     end