fix typos in docs
fix typos in docs

sathieu/stdeb,benthomasson/stdeb,LeMeteore/stdeb,sathieu/stdeb,LeMeteore/stdeb,pombredanne/stdeb,astraw/stdeb,sathieu/stdeb,astraw/stdeb,benthomasson/stdeb,benthomasson/stdeb,pombredanne/stdeb,pombredanne/stdeb,astraw/stdeb,LeMeteore/stdeb