tutorial: update menu example to follow menu1
tutorial: update menu example to follow menu1

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branch : feature-sphinx

douglas-larocca/urwid,drestebon/urwid,rndusr/urwid,wardi/urwid,rndusr/urwid,mountainstorm/urwid,Julian/urwid,rndusr/urwid,foreni-packages/urwid,foreni-packages/urwid,hkoof/urwid,douglas-larocca/urwid,urwid/urwid,urwid/urwid,westurner/urwid,ivanov/urwid,harlowja/urwid,harlowja/urwid,mountainstorm/urwid,foreni-packages/urwid,bk2204/urwid,westurner/urwid,ivanov/urwid,douglas-larocca/urwid,drestebon/urwid,inducer/urwid,westurner/urwid,hkoof/urwid,tonycpsu/urwid,inducer/urwid,Julian/urwid,wardi/urwid,inducer/urwid,bk2204/urwid,tonycpsu/urwid,zyga/urwid,bk2204/urwid,mountainstorm/urwid,urwid/urwid,ivanov/urwid,drestebon/urwid,tonycpsu/urwid,hkoof/urwid,zyga/urwid,Julian/urwid,harlowja/urwid,zyga/urwid,wardi/urwid