Why was this question edited after nearly 4 years?
What was the purpose?
It does not seem to serve any purpose what so ever?
What was the reason?
The post was edited to remove noise, such as the "edit" markers, as well as to add alt text for the images contained in the question.
Including "edit:" in posts on Stack Exchange is generally highly discouraged; as posts are supposed to be a repository of information - akin to Wikipedia - including noise like "Edit:" or "Thanks!" is discouraged and people are encouraged to edit it out.
Adding image descriptions and alt text to images helps make that post accessible to people who either can't see images or are using a screen reader.
Please don't roll back useful edits.