I think they mean if your comment refers to lines 310 to 313, you can explicitly specify that range instead of having to arbitrarily select 310 and let the read

I think they mean if your comment refers to lines 310 to 313, you can explicitly specify that range instead of having to arbitrarily select 310 and let the reader infer that you mean the following lines too. (On a side note, I'd observe you may not be able to rely on reviewers consistently and accurately specifying the exact range they mean. It would be like assuming that nobody makes spelling errors in emails.)