First of all, thank you for taking the time to propose edit suggestions to posts on Super User. Your suggestion history shows that many have been accepted, which has been in line with the edits of yours I have reviewed. It's good that you want to learn more about why this one was rejected.
Most of what you changed was reasonable. You left the title alone, moved around the intro sentence around, changed 'pluged' to 'plugged' and added a question mark. You also made a couple of minor phrasing changes which were reasonable as well, though it was not a huge difference. However...
The proposed edit was not substantial enough as it omitted the most important change, inlining OP's image
The image which OP provided but could not inline in the post due to insufficient reputation should be present. If you could only make one change to a post, this is the one to make, as it makes the information immediately available in the post without having to open a link. I rejected the proposed edit on the basis that this should be done first and foremost - you have been with us on Super User for some time and as such have the reputation to do so.
This is one of the bullet points on the editing help page:
Edits are expected to be substantial and to leave the post better than you found it. Common reasons for edits include:
- To add related resources or hyperlinks
in addition to the other reasons, fixing spelling and grammar issues - as you did - included.
You could have made some other changes to the post, such as shortening the title or otherwise tidying it up. You might also have changed the tags, and a line break or two may aid readability.
I hope this doesn't put you off proposing edits! You have correctly asked a reasonable question about one of your proposed edits, and this should give you a way to make future edit suggestions even better.
