CSH tooltips should be placed nearer to the text
Since #24578 the tooltips are on top of the labels, improving the usability. But they are some px too far away. Also the (?) icon in the docheader, the arrow pointing out to the tooltip is not placed aligned with the icon.
Solution is to offset the pointer -10px and also move the tooltip closer with some ExtJS magic.
(issue imported from #M17163)