Recently an answer of mine (https://mathoverflow.net/a/20820/402) was edited (or rather, a suggested edit was approved by two other users). The edit consisted exclusively of minor formatting changes, it mostly inserted dollar signs, e.g., replaced 1 with \$1\$ etc. It also introduced several formatting and typographical mistakes (such as using : instead of \colon, typesetting W*, L, and E in italic instead of roman font, using \Bbb R instead of \bf R, and including an additional sentence in a list item, the latter problem had to be fixed in an independent edit).
Since such edits unnecessarily bump the questions to the top of the front page while adding nothing to the answer, the current policy seems to discourage them, or at least this seems to be the case from reading the highest voted answer at What's our consensus on people resurrecting old questions just to edit formatting?.
What is the appropriate course of action in this case? Should I simply silently rollback to the latest correct version (revision 2 in this case), hoping that the users involved will eventually learn of the above policy?
Or should I also attempt to inform them of this policy? If so, what is the best way to do this? I certainly don't want to leave comments about this below the answer itself, because this would clutter the comment thread with completely irrelevant comments.
Also, would it be possible to codify the somewhat informal policy explained in the answer above? For example, add the relevant clarifications (e.g., specifically discouraging or even disallowing edits that only add \$ signs) to this page: https://mathoverflow.net/help/editing.