fix typo in docstring
fix typo in docstring

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