The Stack Exchange policy seems to be to disallow edits of fewer than six characters. However, often in technical subjects an edit of a single character can make a critical difference.
I just experienced this here, where I wanted to correct a key-stroke sequence for a computer operation. The correction amounted to a single character, changing
C-x. The hack I came up with, and for which I am embarrassed to have had to resort, was to add a sequence of x's to the end of the post. My intent was to follow-up that with a second edit to delete the x's. Quite a kludge.
Please either provide me guidance on how to properly perform these types of edits, or consider changing the policy for some or all Stack Exchange sites.