update add note id link (#229)

src/exporting.md

@@ -16,7 +16,7 @@ your edits, provided you import back into the same note type.
 If you find yourself needing to edit the first field as well, you'll
 need to change the format of your note type so that the first field is
 an ID number rather than actual text. (You can install
-the [Add note id](https://ankiweb.net/shared/info/1672832404)
+the [Add note id](https://ankiweb.net/shared/info/8897764)
 add-on to make this easier.)
 
 In order for formatting to be preserved when you import text back in,