OK, just checked the FDHD Manual. It is specific to the Macintosh, indicating the drive can only format Macintosh disks and MS-DOS disks, and requires System 6.0.

So, my guess here is the manual was revised to include the Apple II, most likely at the same time the name was changed to "SuperDrive".

However, it begs the question, when did the Apple II get the SuperDrive, and if not in 1990, were there more than one update to the manual after the name change?

Is there any chance the Apple II Had it's own custom SuperDrive manual separate from the Macintosh manual since it also required the instalation of a new card?