scrolledwindow: Fix func summary being cut off in bindings using doxygen
...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.
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