The section Amarok/Manual/Playlist/QueueManager#How to Edit the Queue used to mention button in right-bottom corner of Amarok. This has now been changed to using the menu. Am I right in thinking that the old text was for the new 4.5 series and the new text is reverting to the situation with the 4.4 series? Is so, perhaps the old text should probably be reinserted (perhaps mentioning the menu option for users of older versions).
KDE UserBase Wiki 