Correction marks highlight changes while working on a draft. Lately, strike-through has also become a hip visual style.
To visually record important changes in our text, we can expressively cancel a part of the previous version by marking it
strike-through. The opposite action is to mark a part as later.
The extension strike-through has been introduced by GitHub, because a hell of a lot collaborative work is going on there. On a finalized page it tends to look unprofessional if it’s not some kind of change-log.
Strike-through is applied by surrounding text with two swung dashes on every side like
~~deletion~~. There is no Markdown syntax for an insertion available in Hugo (yet), but you can use the replacement code with the plus sign like
See the second paragraph.