improve docs
improve docs

cccco/qxmpp,unisontech/qxmpp,KangLin/qxmpp,ycsoft/qxmpp,trulabs/qxmpp-old,Ilyatk/qxmpp,gamenet/qxmpp_old,gotomypc/qxmpp,trulabs/qxmpp-old,unisontech/qxmpp,Ilyatk/qxmpp,deepak899/qxmpp,LightZam/qxmpp,LightZam/qxmpp,ycsoft/qxmpp,gamenet/qxmpp,olesalscheider/qxmpp,cccco/qxmpp,gamenet/qxmpp_old,unisontech/qxmpp,pol51/QXMPP-CMake,cccco/qxmpp,KangLin/qxmpp,kollix/qxmpp,gamenet/qxmpp,gamenet/qxmpp_old,gotomypc/qxmpp,gamenet/qxmpp,deepak899/qxmpp,ycsoft/qxmpp,Kaffeine/qxmpp,olesalscheider/qxmpp,pol51/QXMPP-CMake,Kaffeine/qxmpp,gotomypc/qxmpp,Kaffeine/qxmpp,KangLin/qxmpp,LightZam/qxmpp,trulabs/qxmpp-old,Ilyatk/qxmpp,olesalscheider/qxmpp,pol51/QXMPP-CMake,deepak899/qxmpp,kollix/qxmpp,kollix/qxmpp