If you have multiple suggestions that you are fixing at one time, you have a few ways to do it. Remember that the comment box is free form, put whatever you want in it.
If you can use one common 'comment' for multiple suggestions, then you can put that comment in to the box, select the suggestions that it applies to and update the status.
If you want to put a comment that includes info about both, ie 'changed birth and death dates', select the suggestions that the comment is for that you corrected and update the status
You can enter the comment for the suggestion at the top and update it, then select the Status at the far right of another suggestion that fixed, which will reload the page with that suggestion at the top, either select a suggested comment OR enter your own comment, and update the status. Repeat until you have updated the status for all suggestions that you fixed.