Re: pxref

[Richard M. Stallman]

      Morover, it is _never_ correct
    Texinfo usage to put a full sentence inside @pxref, so this particular
    period can _never_ end a valid sentence.

That is true.  However, the reason it is not correct Texinfo usage
to use @pxref for an entire parenthetical sentence
is that the correct way to do that is with `(@xref{args}.)'.
That will also generate a period before the closeparen
resulting in similar Info output.

I don't think Emacs can distinguish one case from the other.

If it would give good results to hide that period in both cases, then
it can be done.