This allows backporting documentation from the `master` branch more easily,
as it already features the `[kbd]` tag.
Co-authored-by: Yuri Sizov <11782833+YuriSizov@users.noreply.github.com>
Change the order of checks in _class_desc_select to first try checking current page and GlobalScope before resorting to slicing either side of the first ".". This may change previous search behaviours - previously if both x.y and @GlobalScope.x.y existed, _class_desc_select would select the former; it will now select the latter.
Also tidies up some comments.
