Fix a markup error in news.rst.
Fix a markup error in news.rst.

This commit also silences a couple of Sphinx warnings e.g.

    WARNING: Bullet list ends without a blank line;
    unexpected unindent.

zhoucen/gunicorn,MrKiven/gunicorn,mvaled/gunicorn,ccl0326/gunicorn,zhoucen/gunicorn,z-fork/gunicorn,wong2/gunicorn,1stvamp/gunicorn,jamesblunt/gunicorn,beni55/gunicorn,prezi/gunicorn,tempbottle/gunicorn,1stvamp/gunicorn,ccl0326/gunicorn,gtrdotmcs/gunicorn,zhoucen/gunicorn,prezi/gunicorn,GitHublong/gunicorn,ccl0326/gunicorn,wong2/gunicorn,elelianghh/gunicorn,malept/gunicorn,gtrdotmcs/gunicorn,tejasmanohar/gunicorn,jamesblunt/gunicorn,mvaled/gunicorn,WSDC-NITWarangal/gunicorn,gtrdotmcs/gunicorn,keakon/gunicorn,ephes/gunicorn,harrisonfeng/gunicorn,jamesblunt/gunicorn,malept/gunicorn,prezi/gunicorn,1stvamp/gunicorn,malept/gunicorn,mvaled/gunicorn,wong2/gunicorn