update signals reference docs for weak signals
update signals reference docs for weak signals

inducer/urwid,ivanov/urwid,wardi/urwid,inducer/urwid,rndusr/urwid,hkoof/urwid,urwid/urwid,harlowja/urwid,drestebon/urwid,tonycpsu/urwid,rndusr/urwid,ivanov/urwid,tonycpsu/urwid,harlowja/urwid,urwid/urwid,drestebon/urwid,wardi/urwid,hkoof/urwid,harlowja/urwid,ivanov/urwid,douglas-larocca/urwid,inducer/urwid,urwid/urwid,douglas-larocca/urwid,douglas-larocca/urwid,foreni-packages/urwid,tonycpsu/urwid,foreni-packages/urwid,hkoof/urwid,wardi/urwid,foreni-packages/urwid,drestebon/urwid,rndusr/urwid