fix links to documentation downloads on download page
fix links to documentation downloads on download page

--HG--
extra : convert_revision : svn%3A3ed01bd8-26fb-0310-9e4c-ca1a4053419f/networkx/trunk%401048

jni/networkx,kernc/networkx,jtorrents/networkx,dhimmel/networkx,jcurbelo/networkx,farhaanbukhsh/networkx,kai5263499/networkx,cmtm/networkx,jakevdp/networkx,bzero/networkx,nathania/networkx,nathania/networkx,Sixshaman/networkx,kernc/networkx,ltiao/networkx,ghdk/networkx,JamesClough/networkx,goulu/networkx,tmilicic/networkx,blublud/networkx,kai5263499/networkx,aureooms/networkx,ghdk/networkx,ionanrozenfeld/networkx,SanketDG/networkx,farhaanbukhsh/networkx,dhimmel/networkx,aureooms/networkx,RMKD/networkx,jtorrents/networkx,chrisnatali/networkx,debsankha/networkx,michaelpacer/networkx,ionanrozenfeld/networkx,sharifulgeo/networkx,jni/networkx,harlowja/networkx,kernc/networkx,chrisnatali/networkx,harlowja/networkx,aureooms/networkx,NvanAdrichem/networkx,jfinkels/networkx,harlowja/networkx,andnovar/networkx,sharifulgeo/networkx,RMKD/networkx,ghdk/networkx,beni55/networkx,dmoliveira/networkx,blublud/networkx,jni/networkx,nathania/networkx,blublud/networkx,dmoliveira/networkx,dmoliveira/networkx,kai5263499/networkx,dhimmel/networkx,bzero/networkx,farhaanbukhsh/networkx,chrisnatali/networkx,wasade/networkx,RMKD/networkx,OrkoHunter/networkx,ionanrozenfeld/networkx,jakevdp/networkx,bzero/networkx,sharifulgeo/networkx,yashu-seth/networkx,jakevdp/networkx,debsankha/networkx,debsankha/networkx