Add information about how to exit the fc-edit mode

[souew]

On this page we have a convenient table with most used shortcuts, https://www.leonrische.me/fc/review.html
one of them is (p) - pause for edit, but there are no information of how to exit it after edit is done. I found in the source that the correct way is C-c C-c to resume the review or C-c C-k to quit. I think it should be added somewhere on the linked page since not having this information would make new users frustrated.