I am confused by the instructions about editing
Edits are expected to be substantial and to leave the post better than you found it. Common reasons for edits include: To fix grammar and spelling mistakes ...
This seems to be a little contradictory to me. Is correcting a couple of typo like misspellings "substantial". In particularly, I am curious because of the edits made to https://academia.stackexchange.com/posts/16976/revisions. The first edit was by a high rep user and fixed a single typo in the question title by adding a character. The second edit was by a new user and changed an American English spelling to British English and fixed two typos by changing a single letter in each case.
How do we fell about seemingly minor edits of these types?