Since we're on the subject of Elisp development help, can we restart the
discussion on how to get the `elisp--xref-backend` activated in *Apropos*
and help? The default `etags--xref-backend` isn't very useful there. Plus,
when one is used to M-. and M-, it's a little strange to have to switch to C-h o
to follow the very commonly occurring references to symbols.
I recall correctly, we had already settles that it's a decently good idea,
but we ran into some loading precedence problem and the effort stalled.
Is that the right recollection? It doesn't seem to make a lot of sense,
since all we apparently need is `add-hook`.
Anyway, it can be argued that `elisp--xref-backend` isn't the _best_ choice
for those buffers, and that we should be taking the user to say, the manual
when searching from those places. Or maybe, the `elisp--xref-backend` could
also collect matches from the manual, why not?