This git alias allows you to remove specific changes from a past commit / from git history and place those changes into your working directory, outside of your git history.
For example, maybe a code reviewer has identified a few files or lines that belong in their own commit or pull request. This helps you do git commit surgery on specific commits without needing to manually re-play.
git edit {commithash}
(e.g. git edit HEAD
would edit the most recent commit or git edit c52b7bfe12c2f6082a69ea339eeec95a20532fa5
would edit a specific commit)