You can undo (and redo) your edits to individual rows (also referred to as 'paragraphs') in the specification editor. This video explains how.
On Windows, the keyboard shortcuts are:
Undo is Ctrl+Z
Redo is Ctrl+Shift+Z
On Mac:
Undo is Command+Z
Redo is Command+Shift+Z
You need to click on each row you have edited to undo the changes. You do not have to undo rows in the order you edited them. By selecting the row, this tells the platform you want to undo that row.
Please note: Once you move onto something else in your specification, you lose the option to undo rows in a previously checked-out article or clause.