"Section 5.15.6" of "Book of Vaadin(7)" is wrong

In “Book of Vaadin” (Vaadin 7 Edition - 2nd Revision) ==> Section 5.15.6 ==> CSS Style Rules:

https://vaadin.com/book/-/page/components.selecting.html

…If set, the left and right column captions have
v-select-twincol-options-caption
and


v-select-twincol-options-caption


style names, respectively. The left box, which displays the unselected items, has


v-select-twincol-options-caption


style and the right box, which displays the selected items, has


v-select-twincol-options-selections


style. Between them is the button area, which has overall v-select-twincol-buttons style…

I think the style names described above are not right. they should be:

…If set, the left and right column captions have
v-select-twincol-options-caption
and


v-select-twincol-selections-caption


style names, respectively. The left box, which displays the unselected items, has


v-select-twincol-options


style and the right box, which displays the selected items, has


v-select-twincol-selections


style. Between them is the button area, which has overall v-select-twincol-buttons style…

I also checked the 6th editon of this book, same problem is there:

https://vaadin.com/book/vaadin6/-/page/components.selecting.html

I have created a ticket for this problem:

http://dev.vaadin.com/ticket/13520