...which treats the first '.' in doc comments as the end of the summary.
So, e.g., in gtkmm, get_kinetic_scrolling() is currently summarised as
"Changes the behaviour of @scrolled_window wrt." Not very informative!

No need for a period there & anyway, the phrase "wrt to" is superfluous,
and we have space to actually say "with regard to", so just do that now.