With several artboards selected with the Artboard tool, the Artboards
panel menu's Rename opened the name field on the active artboard's row
and renamed that artboard only.
Rename now opens an empty name field on the active artboard's row, and
so does a double-click on a name with Shift or Ctrl/Cmd held that
leaves several artboards selected. The name typed there goes to every
selected artboard, numbered in panel order (abc-1, abc-2, abc-3), in
one undo step through the artboards list of artboard.setProps. With
one artboard selected, Rename and a double-click on a name rename that
artboard as before.
Docs: docs/target-app-parity.md.