Fixing two minor reStructuredText typos.
Fixing two minor reStructuredText typos.

They were introduced in 82bd30d581346c86bbd3e711068e5abd1a40fc4d and
unfortunately included in Disco 0.4.1. I'm still learning reST...

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