Fix note on which branch is used by default.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>
Fix curly brace being on the wrong line.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>
Change `sha` to `SHA`.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>