[docs] Fix doc build error.
[docs] Fix doc build error.

ktkt2009/disco,simudream/disco,beni55/disco,discoproject/disco,simudream/disco,simudream/disco,seabirdzh/disco,ErikDubbelboer/disco,oldmantaiter/disco,pombredanne/disco,seabirdzh/disco,mwilliams3/disco,mwilliams3/disco,ktkt2009/disco,oldmantaiter/disco,oldmantaiter/disco,ktkt2009/disco,pombredanne/disco,pooya/disco,pombredanne/disco,oldmantaiter/disco,discoproject/disco,mozilla/disco,ktkt2009/disco,discoproject/disco,mozilla/disco,mozilla/disco,ErikDubbelboer/disco,seabirdzh/disco,ErikDubbelboer/disco,beni55/disco,beni55/disco,pooya/disco,discoproject/disco,mwilliams3/disco,mwilliams3/disco,discoproject/disco,seabirdzh/disco,simudream/disco,pooya/disco,beni55/disco,simudream/disco,ErikDubbelboer/disco,pombredanne/disco,ErikDubbelboer/disco,ktkt2009/disco,mwilliams3/disco,pombredanne/disco,pooya/disco,oldmantaiter/disco,mozilla/disco,seabirdzh/disco,beni55/disco