doc: Fix a typo, blank lines and trailing spaces.
doc: Fix a typo, blank lines and trailing spaces.

DouglasHeriot/libssh,mwgoldsmith/libssh,sebadoom/libssh,mwgoldsmith/libssh,mwgoldsmith/libssh,mwgoldsmith/ssh,DouglasHeriot/libssh,taikoo/libssh,mwgoldsmith/ssh,robxu9/libssh,kedazo/libssh,wangshawn/libssh,pouete/libssh,pouete/libssh,mwgoldsmith/ssh,nviennot/libssh,wangshawn/libssh,nviennot/libssh,kedazo/libssh,robxu9/libssh,robxu9/libssh,taikoo/libssh,taikoo/libssh,pouete/libssh,Distrotech/libssh,sebadoom/libssh,Distrotech/libssh,nviennot/libssh,Distrotech/libssh,taikoo/libssh,kedazo/libssh,mwgoldsmith/libssh,pouete/libssh,sebadoom/libssh,DouglasHeriot/libssh,wangshawn/libssh,mwgoldsmith/ssh,kedazo/libssh,robxu9/libssh,DouglasHeriot/libssh,sebadoom/libssh,nviennot/libssh,Distrotech/libssh,wangshawn/libssh